2027 Jayco Seismic 399 vs 415
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Key differences
Both are 2027 Fifth-wheel toy hauler models from the Jayco Seismic line. Here's how they differ, from manufacturer specifications.
- The 415 is 1′ 3″ longer: 46′ 5″ vs 45′ 2″.
- The 399 is 1,005 lb lighter unloaded: 15,585 vs 16,590 lb.
- The 415 has a 1,000 lb higher GVWR: 22,000 vs 21,000 lb.
- The 399 lists 5 lb more cargo capacity: 5,415 vs 5,410 lb.
- The 399 has a 455 lb lighter hitch weight: 3,265 vs 3,720 lb.
- The 399 sleeps 2 more: 8 vs 6.
- The 399 has a $6,000 lower published MSRP: $134,243 vs $140,243.
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YOUR SHORTLIST
Floorplan
PRICING
Manufacturer price (USD)
$134,243Starting MSRPChecked 2026-10-23 · Price source
$140,243Starting 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
$1,135/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″
46′ 5″
Garage length
13′ 6″
15′ 0″
Exterior width
8′ 6″
8′ 6″
Exterior height
13′ 3″
13′ 2″
Shipping / unloaded weight
15,585 lb
16,590 lb
GVWR
21,000 lb
22,000 lb
Listed cargo capacity
5,415 lb
5,410 lb
Listed hitch weight
3,265 lb
3,720 lb
LIVING & SLEEPING
Sleeping capacity
8
6
Slide-outs
—
—
Main bed
Not verified
Not verified
Bunk beds
Not verified
Not verified
Dinette
Not verified
Not verified
Bathroom
Not verified
Not verified
Refrigerator
Not verified
Not verified
TANKS & EVERYDAY FEATURES
Fresh water
106 gal
106 gal
Gray water
87 gal
87 gal
Black water
87 gal
87 gal
Awning length
21′ 0″
13′ 0″
Shore power / electrical service
Not verified
Not verified
Solar equipment
Not verified
Not verified
Outdoor kitchen
Not verified
Not verified
Washer/dryer prep
Not verified
Not verified
Microwave
Not verified
Not verified
Cooktop
Not verified
Not verified
Air conditioning
Not verified
Not verified
Electric fireplace
Not verified
Not verified
Backup camera
Not verified
Not verified
Propane tanks
—
—
Tire size
ST215/75R17.5'H'
ST215/75R17.5'H'
SOURCES & VERIFICATION
Weight basis
Manufacturer unloaded vehicle weight
Manufacturer unloaded vehicle weight
Source checked
2026-10-23 Manufacturer ↗
2026-10-23 Manufacturer ↗
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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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