2025 Keystone RV Alpine Avalanche Edition 366LS

Luxury Has Met Its Match.

Where craftsmanship meets adventure — the all-new Alpine Avalanche 366LS redefines what it means to travel in luxury. Built for the road warrior who demands both strength and sophistication, this fifth wheel combines residential-style comfort with Keystone’s industry-leading engineering.

From the 12" I-beam construction and Z-frame technology beneath your feet to the wide-body design and dual-pane panoramic windows that surround you, every inch is built for long-term durability and refined comfort.

Step inside to a serene Dovetail interior décor, solid hardwood cabinetry, Thomas Payne® theatre seating with heat and massage, and a 40” designer fireplace that turns every night into something unforgettable. With Polar Pack insulation, heated underbelly, and dual 15K BTU A/Cs, the 366LS delivers true four-season performance — so you can chase adventure without compromise.

The 2025 Alpine Avalanche Edition 366LS isn’t just an RV — it’s a home built for those who believe the journey should feel just as incredible as the destination.

Key Specifications

Length: 39' 3" | Width: 100" | Height: 13' 4"

Dry Weight: 13,900 lbs | Hitch Weight: 2,720 lbs | GVWR: 16,500 lbs

Fresh Water: 66 gal | Grey Water: 83 gal | Black Water: 49 gal

LP Capacity: 60 lbs | Sleeping Capacity: Up to 6

Construction & Chassis

12" I-Beam frame with Z-Frame Technology

Laminated sidewalls with double-welded aluminum construction

Painted fiberglass cap with Key Shield™ protection

Road Armor™ suspension and shock-absorbing hitch pin

Dexter® 7,000 lb. axles

MaxTurn™ Technology and Hitch Vision™ with LED lighting

Heated and enclosed underbelly for extended-season camping

All-Season Package

Polar Pack protection with tank heat ducting

12V heat pads on tanks

Dual-pane windows (80% tint)

Slide topper awning package

Heated Nautilus™ water centre

Interior Highlights

Summit slide rooms with 6'10" interior height

Dovetail interior décor — modern, bright, and inviting

Solid wood cabinetry & hardwood fascia

Night roller shades and designer window valances

Thomas Payne® theatre seating with heat, massage, LED lights & USB ports

40" designer fireplace with decorative surround

Crown moulding throughout for a residential touch

Exterior Features

6-point hydraulic auto-levelling system

Sailun G-rated tires with TPMS prep

Generator prep

2" towing hitch (3,000 lb. capacity)

Carefree power awning with LED lighting

Outside shower

Back-up & side camera prep

150 Cu. Ft. heated basement storage with dual-latch “slam” doors

Technology & Convenience

Solar prep & Wi-Fi prep

Motion-sensor lighting in storage areas

Residential HVAC system

Easy-access control panels

Luxury isn’t found in the destination — it’s in every mile you travel beautifully.

Specifications

General
Class	FIFTH WHEEL
Length (FT)	40' 10"
Hitch Weight (LBS)	2295 LBS
Dry Weight (LBS)	13940 LBS
Sub Class	Rear Kitchen
Shop By Length	40 and Over
Shop By Weight	Over10000 LBS
Total Fresh Water Tank Capacity (GAL)	75
Total Gray Water Tank Capacity (GAL)	83
Total Black Water Tank Capacity (GAL)	49
Total Propane Tank Capacity (LBS)	60
# of Propane Tanks	2
Awning Length (FT)	20ft & 16ft
Inventory Options	DRY WEIGHT:13955 LBS HITCH WEIGHT:2365 LBS GREY WATER HOLDING TANK:83 GAL BLACK WATER HOLDING TANK:49 GAL FRESH WATER HOLDING TANK:75 GAL
Vin	4YDFAVT20SE760174

Other Specifications
Exterior Color	WHITE
Secondary Category	Int: Dovetail

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