# Keystone Fuzion 421

Fuzion 421 is a toy hauler floor plan by Keystone.

## Specs (2026 model year)

| Spec | Value |
| --- | --- |
| Sleeps | 8 |
| Slide-outs | 3 |
| MSRP | $143,295 |

## Model years

2026, 2025, 2024, 2023. Year-specific specs: `https://rvenvy.com/toy-haulers/keystone/fuzion/421?year={year}`

## Overview

A huge garage gives the Keystone Fuzion 421 room for serious toys while the patio system creates an inviting outdoor hangout at camp. Inside, residential-style furniture with heated massage seats, a fireplace, solid-surface kitchen counters, and a 16-cubic-foot refrigerator bring a luxury feel to the living space. Three A/C units, a 5,500-watt generator, and a 173-gallon fresh-water tank support extended off-grid stays, while the full bath keeps the layout self-contained.

## Inventory

No units currently for sale. Search similar inventory: https://rvenvy.com/inventory

Floor plan diagram: https://images.rvenvy.com/7a3bdaf15fc3ab42656b40d7f3908d16a81adb3eecad20de2035a394f15d53c3/1024.webp

Canonical page: https://rvenvy.com/toy-haulers/keystone/fuzion/421