# Tiffin Cornerstone Series 6 645D

> Rear closet, bath and a half, dual vanity, walk-in closet

Cornerstone Series 6 645D is a class a floor plan by Tiffin.

## Specs (2027 model year)

| Spec | Value |
| --- | --- |
| Length | 45 ft |
| Sleeps | 7 |
| Slide-outs | 4 |
| GVWR | 54,000 lbs |

## Model years

2027. Year-specific specs: `https://rvenvy.com/class-a-motorhomes/tiffin/cornerstone-series-6/645d?year={year}`

## Overview

The Tiffin Cornerstone Series 6 645D brings flagship-level power and refinement to the road with a 605 HP Cummins X15 diesel, steerable tag axle, independent front suspension, and adaptive safety technology. Inside, hydronic heating, residential-style systems, and Spyder touchscreen controls put comfort and coach management at your fingertips. Its 45-foot layout includes a full bath, while the insulated construction and ducted air cooling system help create a remarkably quiet, comfortable interior.

## Floor plan tags

bath and a half, dual vanity, walk-in closet, front living, rear bath

## Inventory

1 unit currently for sale: https://rvenvy.com/class-a-motorhomes/tiffin/cornerstone-series-6/645d/inventory

Floor plan diagram: https://images.rvenvy.com/8d9fd64df5969a05760052008bfc62f4baae1857f9f1a32634df82d93e8cf534/1024.webp

Canonical page: https://rvenvy.com/class-a-motorhomes/tiffin/cornerstone-series-6/645d