01 What makes it unique
The 3704BH is the Influence family bunkhouse: a private rear bunk room, a front private bedroom and four slide-outs in a widebody layout, sleeping eight — the most berths short of the 3904BH. The rear bunk room and front bedroom bracket a wide main level, with dual entries into the coach. At about 40 feet on quad slides it is the largest three-bedroom-capable plan in the line short of the dual-master 3804DS. 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 14,798-pound dry weight, leaving a 2,002-pound cargo capacity — the tightest in the line — and a 2,728-pound dry pin. A single 15,000-BTU air conditioner and 81/106/106-gallon fresh/grey/black tanks — with a larger 106-gallon black tank for family use — are standard, with six-point auto-leveling available. At a starting MSRP around $119,459, with street pricing below placard, the 3704BH is the Influence for families who want a private bunk room and a front bedroom in a widebody coach, towed with a one-ton truck — load it carefully against its tight cargo margin.
02 Full specifications
Dimensions
- Exterior length
- 40' 4"
- 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)
- 14,798 lbs
- GVWR (max loaded)
- 16,800 lbs
- Net cargo / payload (CCC)
- 2,002 lbs
- Dry pin (hitch) weight
- 2,728 lbs
Capacities
- Fresh water
- 81 gal
- Grey water
- 106 gal
- Black water
- 106 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
- 8
- Slides
- 4
- Entries
- 2
- 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 3704BH 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
Private rear bunk room
A dedicated rear bunk room and a front private bedroom on quad slides — a widebody family layout sleeping eight.
Larger 106-gallon black tank
Grey and black tanks are both 106 gallons — extra holding capacity for family stays.
Tightest cargo in the line
Its 2,002-pound CCC is the smallest Influence payload — watch loaded weight closely if you carry a lot of gear, water and passengers.
Wants a one-ton truck
A 16,800-pound-GVWR widebody fifth wheel with dual entries — confirm a properly rated one-ton truck’s payload and rear-axle rating.
05 How it compares
Keystone’s luxury Montana bunkhouse — a comparable family full-profile fifth wheel.
Jayco’s North Point — a full-profile family fifth wheel on a wide-body platform.
The 3904BH — a longer bunkhouse with an outdoor kitchen, a bath-and-a-half and more payload.