01 What makes it unique
The 3503GK is the 3203GK’s rear-galley-kitchen format opened out for more room: a residential kitchen across the rear wall, a private front bedroom and a fireplace, stretched to about 38 feet on three slide-outs, sleeping four. The extra length goes into living space around the same couples’ layout. The equipment is the standard Influence package — a 16-cubic-foot 12-volt refrigerator, gel-coat sidewalls and the 330-watt Influence Solar Package — on the 101-inch wide-body platform inside a five-sided welded-aluminum cage, under a walk-on Thermal Roof, with a fully enclosed, heated underbelly.
Grand Design publishes a 16,800-pound GVWR against the 13,868-pound dry weight, leaving a 2,932-pound cargo capacity and a 2,670-pound dry pin. A single 15,000-BTU air conditioner and 81/106/53-gallon fresh/grey/black tanks are standard, with six-point auto-leveling available. At a starting MSRP around $116,247, with street pricing below placard, the 3503GK is the Influence for a couple who wants the rear-galley layout with more length and living space, towed with a properly rated three-quarter-ton or one-ton truck.
02 Full specifications
Dimensions
- Exterior length
- 38' 3"
- Exterior width
- 8' 5" (101″ wide-body)
- Exterior height
- 13' 5"
- Chassis
- 101″ wide-body · welded-aluminum five-sided cage
Weights
- Dry / unit base weight (UVW)
- 13,868 lbs
- GVWR (max loaded)
- 16,800 lbs
- Net cargo / payload (CCC)
- 2,932 lbs
- Dry pin (hitch) weight
- 2,670 lbs
Capacities
- Fresh water
- 81 gal
- Grey water
- 106 gal
- Black water
- 53 gal
- Refrigerator
- 16 cu ft 12V
Construction
- Body cage
- Five-sided welded-aluminum cage
- Roof
- Walk-on · Thermal Roof R-40 (fiberglass + radiant foil, vented attic)
- Walls
- Fully laminated R-11 · welded-aluminum framed, rigid foam
- Main floor
- Triple-insulated R-45 (radiant foil + fiberglass)
- Underbelly
- Fully enclosed & heated (all-weather) · heated tanks
- Exterior
- Gel-coat sidewalls
Running gear
- Axles
- 2 (tandem)
- Hitch
- Fifth-wheel (in-bed) pin box
- Solar
- Influence Solar Package · 330W panel, controller, inverter prep
- Leveling
- 6-point hydraulic auto-leveling (optional)
Galley & systems
- Refrigerator
- 16 cu ft 12-volt residential
- Air conditioning
- 15,000 BTU
- Solar / electrical
- Influence Solar Package · 330W · inverter prep
- Water heater
- Gas / electric
Sleeping & layout
- Sleeps
- 4
- Slides
- 3
- Entries
- 1
- Awnings
- 2
- Primary bed
- Queen (king optional)
03 The Influence floorplan family
Influence is Grand Design's residential-style full-profile fifth wheel on the 101-inch wide-body platform that underpins the flagship Solitude, offered at a lower entry point — a cross-shop against Keystone's Cougar and Montana, Jayco's Eagle and North Point, with the Grand Design Reflection a step below. The 2026 line runs to seven floorplans, all profiled in full and linked below. The 3503GK on this page is highlighted.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 2903RL | 34 ft | 4 | Rear living, kitchen island, front master |
| 3003RL | 34 ft | 4 | Rear living, kitchen island, big payload |
| 3203GK | 35 ft | 3 | Rear galley kitchen, private front bedroom |
| 3503GK | 38 ft | 4 | Rear galley kitchen, stretched living space |
| 3704BH | 40 ft | 8 | Private bunk room, quad slides, family |
| 3804DS | 42 ft | 6 | Two masters, two full baths, loft |
| 3904BH | 42 ft | 9 | Bunkhouse, outdoor kitchen, bath-and-a-half |
Influence is Grand Design's residential-style full-profile fifth wheel — the 101-inch wide-body platform that underpins the flagship Solitude, offered at a lower entry point. The 2026 line runs to seven floorplans, all profiled here in full. Every Influence rides the 101-inch wide-body platform inside a five-sided welded-aluminum cage, under a walk-on Thermal Roof (R-40, fiberglass and radiant foil over a vented attic), with fully laminated R-11 walls, a triple-insulated R-45 main floor and a fully enclosed, heated all-weather underbelly with heated tanks. The Influence Solar Package — a 330-watt panel with controller and inverter prep — a 16-cubic-foot 12-volt refrigerator and gel-coat sidewalls are standard, with six-point hydraulic auto-leveling and a third air conditioner with heat pump available. Dry weight, GVWR, CCC and pin are published per plan and each plan's dry weight plus CCC equals its GVWR exactly. Real loaded pin weights run higher — always weigh the loaded coach and confirm against your truck's payload and rear-axle ratings.
04 What owners & reviewers report
Rear galley with more length
The 3203GK rear-galley-kitchen format stretched to about 38 feet — more room in the living area around the same couples’ layout.
Private front bedroom
A private front bedroom and a fireplace, with the residential kitchen across the back wall.
Watch loaded weight
Its 2,932-pound CCC is tighter than the shorter 3203GK — plan gear and water against it.
Wants a three-quarter-ton+ truck
A 16,800-pound-GVWR full-profile fifth wheel — confirm a properly rated three-quarter-ton or one-ton truck’s payload and rear axle.
05 How it compares
Keystone’s luxury Montana — a comparable longer rear-kitchen full-profile fifth wheel.
The 3203GK — the same rear-galley format, shorter and lighter with more cargo headroom.
The flagship Solitude on the same platform — a longer, more luxurious option above the Influence.