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2027 Jayco Seismic 399 vs Keystone Fuzion Impact Edition 418

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2027 Grand Design Reflection 317RSTS floorplanGrand Design Reflection 317RSTSTravel trailer, 35′ 5″2027 Keystone Montana High Country 290RL floorplanKeystone Montana High Country 290RLFifth wheel, 33′ 11″2027 Grand Design Momentum 344M floorplanGrand Design Momentum 344MFifth-wheel toy hauler, 39′ 11″

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Key differences

Both are 2027 Fifth-wheel toy hauler models. Here's how they differ, from manufacturer specifications.

  • The Keystone Fuzion Impact Edition 418 is 9″ longer: 45′ 11″ vs 45′ 2″.
  • The Keystone Fuzion Impact Edition 418 is 323 lb lighter unloaded: 15,262 vs 15,585 lb.
  • The Jayco Seismic 399 lists 2,315 lb more cargo capacity: 5,415 vs 3,100 lb.
  • The Keystone Fuzion Impact Edition 418 has a 165 lb lighter hitch weight: 3,100 vs 3,265 lb.
  • Both sleep 8.
  • The Jayco Seismic 399 holds 12 gal more fresh water: 106 vs 94 gal.
  • The Keystone Fuzion Impact Edition 418 has a $8,686 lower published MSRP: $125,557 vs $134,243.
YOUR SHORTLIST
Jayco Seismic

399

2027 · Fifth-wheel toy hauler

Specs & prices
Keystone Fuzion Impact Edition

418

2027 · Fifth-wheel toy hauler

Specs & prices
Floorplan
PRICING
Manufacturer price (USD)
$134,243Starting MSRPChecked 2026-10-23 · Price source
$125,557Published MSRPChecked 2026-10-23 · Price source
Lowest tracked dealer price (USD)
No recently verified dealer price
No recently verified dealer price
Est. monthly payment (USD)
$1,086/mo20 years at 8.99% APR with 10% down, based on the MSRP. Before tax and fees.Customize this payment
$1,016/mo20 years at 8.99% APR with 10% down, based on the MSRP. Before tax and fees.Customize this payment
DIMENSIONS & WEIGHTS
Exterior length
45′ 2″
45′ 11″
Garage length
13′ 6″
15′ 0″
Exterior width
8′ 6″
—
Exterior height
13′ 3″
13′ 3″
Shipping / unloaded weight
15,585 lb
15,262 lb
GVWR
21,000 lb
—
Listed cargo capacity
5,415 lb
3,100 lb
Listed hitch weight
3,265 lb
3,100 lb
LIVING & SLEEPING
Sleeping capacity
8
8
Slide-outs
—
—
Main bed
Not verified
King bed suite w/ storage
Bunk beds
Not verified
✓ Yes
Dinette
Not verified
Not verified
Bathroom
Not verified
Not verified
Refrigerator
Not verified
16 Cu. Ft. 12V refrigerator
TANKS & EVERYDAY FEATURES
Fresh water
106 gal
94 gal
Gray water
87 gal
88 gal
Black water
87 gal
88 gal
Awning length
21′ 0″
—
Shore power / electrical service
Not verified
50 amp standard
Solar equipment
Not verified
SolarFlex™ Protect 220
Outdoor kitchen
Not verified
✓ Yes
Washer/dryer prep
Not verified
✓ Yes
Microwave
Not verified
✓ Yes
Cooktop
Not verified
Not verified
Air conditioning
Not verified
Chill cube A/C; 2nd ¾ ton A/C; Ducted A/C, ducted heat
Electric fireplace
Not verified
✓ Yes
Backup camera
Not verified
Not verified
Propane tanks
—
2
Tire size
ST215/75R17.5'H'
ST235/80R18G
SOURCES & VERIFICATION
Weight basis
Manufacturer unloaded vehicle weight
Manufacturer shipping weight
Source checked
2026-10-23 Manufacturer ↗
2026-10-23 Manufacturer ↗

Manufacturer floorplan images © their respective manufacturers. Specs checked October 19, 2026; exact-unit labels and production options may differ. “Not verified” or a dash means we have no confirmed value. “Not listed” means the applicable manufacturer equipment was checked but does not mention the feature; it does not mean “No.” “Conflicting data” means manufacturer entries disagree. “Optional” equipment is available but is not confirmed as standard. Camera prep does not confirm an installed camera. Weights are kept separate: unloaded weight, GVWR, cargo capacity, and hitch weight. Confirm every specification for the exact model year and configuration with the manufacturer. This tool does not establish towing compatibility.

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