Skip to main contentSkip to navigation
RV Envy
RV floor plans
Inventory
Sell your RV
Dealers
Dashboard
  • Class A motorhomes
  • Class C motorhomes
  • Class B vans
  • Fifth wheel trailers
  • Travel trailers
  • Pop-up campers
  • Advanced search
  • Floor plan wizard
  • Inventory

Browse popular layouts & features

Class A motorhomes

  • … with bunk beds
  • … with two bedrooms
  • … with bath and a half
  • … with two full bathrooms
  • … with bunk over cab
  • … with rear bathroom
Browse all features →

Class B vans

  • … with King size bed
  • … with rear twin beds
  • … with Murphy bed
  • … with rear bathroom
  • … with dual twin beds
Browse all features →

Class C motorhomes

  • … with bunk over cab
  • … with bunk beds
  • … with rear bathroom
  • … with rear twin beds
  • … with Murphy bed
  • … with outdoor kitchen
  • … with outdoor TV
Browse all features →

Fifth wheel trailers

  • … with bath and a half
  • … with two bathrooms
  • … with bunk beds
  • … with two bedrooms
  • … with side patio
  • … with rear patio
  • … with outdoor kitchen
  • … with washer/dryer
  • … with front living
Browse all features →

Travel trailers

  • … with bunk beds
  • … with two bedrooms
  • … with Murphy bed
  • … with outdoor kitchen
  • … with rear bath
  • … with front bedroom
Browse all features →

Popup campers

  • under $10k
  • under $15k
  • under 2,000 lbs
  • under 3,000 lbs
Browse all features →

RV dealers by metro area

Los AngelesDallas–Fort WorthHoustonAtlantaPhoenixTampa BayOrlandoDenverChicagoSeattleNashvilleTorontoBrowse all metro areas →

Explore

  • RV floor plans
  • Browse inventory
  • Sell your RV
  • Dealers
  • Shopping tips

Company

  • About
  • Our story
  • Contact

Services

  • Dealer leads
  • Dealer websites & CRM
  • OEM advertising
  • Shopper insights

Join our mailing list

We don't send much, but you won't want to miss it!

RV Envy

The RV search engine. Find your dream RV.

We do our best to keep listing details accurate, but pricing, specifications, and availability come from third-party sources and can change without notice. We can't guarantee accuracy, so please confirm the details with the dealer before making any decisions. See something inaccurate? Contact us.

© 2026 RV Envy. All rights reserved.

For AI agentsPrivacyTerms
Dashboard
    1. Home
    2. Fifth wheel trailers
    3. Keystone
    4. Cougar
    5. 310RLS
    Keystone Cougar 310RLS exterior

    Keystone Cougar 310RLS

    Browse inventory (6)
    Keystone Cougar 310RLS floor plan
    Keystone Cougar 310RLS floor plan

    Key facts

    Length
    35 ft 4 in
    Max weight
    12,450 lbs
    Sleeps
    5

    AI summary

    The Keystone Cougar 310RLS puts the living room at the rear, which opens up a surprisingly spacious lounge anchored by a 48" electric fireplace and a 50" HD TV. The kitchen earns its keep too, with LG solid surface countertops, a stainless undermount sink, a chef's faucet with sprayer, and a 12 cubic foot refrigerator. Comfort is well covered by a 15,000 BTU ducted AC, a 35K BTU ducted furnace, a forced-air heated enclosed underbelly, and a 1,000 CFM Maxx Air fan with a rain sensor. An optional King bed, dual-pane frameless windows, and a ducted bedroom AC round out what can be a well-appointed long-haul setup, though prospective buyers should budget time to inspect fit-and-finish carefully, as Keystone's warranty support draws mixed reviews across the Cougar line.

    Owner reviews

    No owner reviews yet. If you've owned one, yours would be the first.

    Find a Keystone Cougar 310RLS

    See it in person or find a great deal nationwide.
    Browse inventory (6)

    Similar floor plans

    Other fifth wheel trailers floor plans (around 35 ft 4 in), similar in size and price to the Cougar 310RLS.

    Forest River Cardinal 23RK exterior

    Forest River Cardinal 23RK

    Front bedroom, rear kitchen

    MSRPTBD

    4 units available

    Forest River Cardinal 23RK floor plan
    Max weight

    9,275 lbs

    Length

    29 ft 4 in

    Sleeps

    4

    Keystone Arcadia Super Lite 253SLRD exterior

    Keystone Arcadia Super Lite 253SLRD

    MSRP$60,443

    4 units available

    Keystone Arcadia Super Lite 253SLRD floor plan
    Max weight

    10,100 lbs

    Length

    29 ft 3 in

    Sleeps

    4

    Jayco Eagle SLE 24MLE exterior

    Jayco Eagle SLE 24MLE

    Front bedroom, rear kitchen, booth dinette

    MSRP$50,243

    134 units available

    Jayco Eagle SLE 24MLE floor plan
    Max weight

    9,500 lbs

    Length

    29 ft 3 in

    Sleeps

    4

    Heartland Sundance XLT 24ML exterior

    Heartland Sundance XLT 24ML

    Front bedroom, rear kitchen, booth dinette

    MSRPTBD

    61 units available

    Heartland Sundance XLT 24ML floor plan
    Max weight

    9,500 lbs

    Length

    29 ft 3 in

    Sleeps

    4

    Highland Ridge Open Range Roamer Light Duty 24MLDS exterior

    Highland Ridge Open Range Roamer Light Duty 24MLDS

    MSRP$48,675

    1 unit available

    Highland Ridge Open Range Roamer Light Duty 24MLDS floor plan
    Max weight

    9,500 lbs

    Length

    29 ft 3 in

    Sleeps

    6

    Forest River Cherokee Black Label 255SBBL exterior

    Forest River Cherokee Black Label 255SBBL

    MSRPTBD
    Forest River Cherokee Black Label 255SBBL floor plan
    Max weight

    9,999 lbs

    Length

    29 ft 3 in

    Sleeps

    4

    Keystone Arcadia Super Lite 293SLRD exterior

    Keystone Arcadia Super Lite 293SLRD

    MSRP$61,882

    8 units available

    Keystone Arcadia Super Lite 293SLRD floor plan
    Length

    29 ft 3 in

    Sleeps

    4

    Coachmen Chaparral Lite 25MKS exterior

    Coachmen Chaparral Lite 25MKS

    MSRPTBD

    1 unit available

    Coachmen Chaparral Lite 25MKS floor plan
    Max weight

    9,800 lbs

    Length

    29 ft 3 in

    Sleeps

    5

    Other Cougar floor plans

    Keystone Cougar 260MLE

    Front bedroom, rear kitchen

    MSRP$76,763

    48 units available

    Keystone Cougar 260MLE floor plan
    Max weight

    12,000 lbs

    Length

    30 ft 11 in

    Sleeps

    4

    Keystone Cougar 280RLS

    MSRPTBD
    Keystone Cougar 280RLS floor plan
    Max weight

    12,065 lbs

    Length

    32 ft 9 in

    Sleeps

    5

    Keystone Cougar 280RLSWE

    MSRPTBD
    Keystone Cougar 280RLSWE floor plan
    Max weight

    12,075 lbs

    Length

    32 ft 9 in

    Sleeps

    6

    Keystone Cougar 288RLS

    MSRPTBD
    Keystone Cougar 288RLS floor plan
    Max weight

    12,105 lbs

    Length

    34 ft 9 in

    Sleeps

    6

    Keystone Cougar 290RLS

    Front bedroom, rear living area, booth dinette

    MSRP$80,670

    49 units available

    Keystone Cougar 290RLS floor plan
    Max weight

    12,900 lbs

    Length

    33 ft 8 in

    Sleeps

    6

    Keystone Cougar 297RKS

    MSRPTBD

    1 unit available

    Keystone Cougar 297RKS floor plan
    Max weight

    11,920 lbs

    Length

    33 ft 9 in

    Sleeps

    4

    Keystone Cougar 301SAB

    MSRPTBD

    2 units available

    Keystone Cougar 301SAB floor plan
    Max weight

    12,355 lbs

    Length

    34 ft

    Sleeps

    6

    Keystone Cougar 302RLS

    MSRP$61,035

    3 units available

    Keystone Cougar 302RLS floor plan
    Max weight

    10,175 lbs

    Length

    34 ft 7 in

    Sleeps

    6

    Keystone Cougar 303RLS

    MSRPTBD

    4 units available

    Keystone Cougar 303RLS floor plan
    Max weight

    12,100 lbs

    Length

    34 ft 8 in

    Sleeps

    6

    Keystone Cougar 307RES

    MSRP$61,831

    1 unit available

    Keystone Cougar 307RES floor plan
    Max weight

    10,121 lbs

    Length

    34 ft 7 in

    Sleeps

    6

    View all Cougar floor plans →
    Keystone Cougar 310RLS overview
    Keystone Cougar 310RLS exterior

    Key facts

    Length
    35 ft 4 in
    Max weight
    12,450 lbs
    Sleeps
    5

    Specs

    Dimensions

    Length
    35 ft 4 in
    Height
    12 ft 6 in
    Width
    8 ft
    Slideouts
    3
    Axles
    2

    Tanks & capacities

    Fresh water
    81 gal
    Gray water
    76 gal
    Black water
    38 gal

    Weight & towing

    Dry weight
    10,159 lbs
    GVWR
    12,450 lbs
    Hitch weight
    2,055 lbs
    1/2 ton truck required
    New Ford F-150, RAM 1500, Sierra 1500, or bigger

    Based on overall weight and weight directly on tow vehicle's hitch and a new model tow vehicle. Please consult with a professional.

    Accommodations

    Sleeps
    5
    Download brochure
    On this page...