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KZ Sportster 321THR13

Travel trailerbuilt 2018–20Mixed build tierFindable on the used market
WHAT ONE COSTS
$26,300est. used (2020, 6 yr old)

Sticker was $42,790 in 2020. Out of production since 2020, so the used market is the only way to buy one. Estimate assumes a 2020 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~9,496 lbestimated as towed, for 2 people

dry weight 8,070 lb + fresh water (75 gal, full) 626 lb + propane + battery 200 lb + gear for 2 600 lb. Brochure dry weight omits water, propane, batteries and your gear; this estimate doesn't.

You want a tow rating around10,555 lb (10% margin)
GVWR (the sticker maximum)10,000 lb
Tongue weight, loaded~1,365 lb (14%)
Cargo capacity1,930 lb
WHICH TOW VEHICLES IT FITS: 34 OF 95

Judged the way the app judges: estimated loaded weight against each vehicle's rating less a 10% margin, per model year, because the 321THR13's published weights changed mid-run.

VEHICLETOW RATINGVERDICT
Chevrolet Silverado / GMC Sierra 1500 (6.2 V8, max tow) '19-2613,300 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow) '24-2622,500 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-2318,510 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-1918,100 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '20-2636,000 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '11-1923,300 lbfits, loaded, with 10% margin
Chevrolet Silverado 1500 (max tow) '14-1812,500 lbfits, loaded, with 10% margin
Chevrolet Silverado EV (4WT) '24-2612,500 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '24-2613,500 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '15-2013,200 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '21-2314,000 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '11-1411,300 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, gooseneck) '20-2222,800 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-1918,000 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel) '11-1616,600 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 HO diesel, gooseneck) '23-2623,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '17-1932,500 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '20-2237,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '11-1621,600 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2638,000 lbfits, loaded, with 10% margin
Ford F-450 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2640,000 lbfits, loaded, with 10% margin
GMC Sierra EV '24-2612,000 lbfits, loaded, with 10% margin
Nissan Titan XD (Cummins diesel) '16-1912,710 lbfits, loaded, with 10% margin
Ram 1500 (3.0 Hurricane, max tow) '25-2611,610 lbfits, loaded, with 10% margin
Ram 1500 (5.7 Hemi eTorque, max tow) '19-2412,750 lbfits, loaded, with 10% margin
Ram 1500 (5.7 Hemi, max tow) '11-1810,620 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins HO) '19-2620,000 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins) '11-1817,980 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins DRW, gooseneck) '13-1831,210 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '25-2636,610 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '19-2437,090 lbfits, loaded, with 10% margin
Rivian R1T '22-2611,000 lbfits, loaded, with 10% margin
Tesla Cybertruck '24-2611,000 lbfits, loaded, with 10% margin
Toyota Tundra (i-Force Max, tow pkg) '22-2612,000 lbfits, loaded, with 10% margin
The 61it doesn't fit

These verdicts assume 2 people aboard with typical gear. See the margin for your truck and your crew →

THE SPECS
Length37.3 ft
Height (incl. A/C)12.3 ft
Width8.5 ft
Interior height7.5 ft
GVWR10,000 lb
Dry weight8,070 lb
Dry tongue weight1,160 lb
Cargo capacity1,930 lb
Sleeps7
Slide-outs1
Axles2
Fresh water75 gal
Grey water32 gal
Black water32 gal
Air conditioning13,500 BTU
Awning19 ft

A missing row means the maker never published that figure: unknown, not zero.

WHERE PEOPLE SLEEP
  • 1× Front king bed(Permanent)—
  • 1× Optional 60×84 power bed with Sit-and-Sleep in the garage(Stow-away)—
  • 1× 80" U-dinette in the slide(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

KZ (Mixed tier): KZ's toy hauler line (Thor Industries), sold as Sportsmen Sportster through 2016, Sportster/Sportster 100 from 2017, and Sportster X since 2025. Construction is mid-pack for the segment — aluminum-framed laminated fiberglass walls, a 3/8" walk-on roof and a heated, enclosed underbelly — with a Tuff Ply garage floor and diamond-plate wall protection that hold up well. KZ's assembly quality is uneven unit to unit, which is why it lands in the middle rather than at the top.

YEAR BY YEAR: WHAT CHANGED
YEARSGVWRDRYMSRP
2018–1910,000 lb7,880 lb$42,790
202010,000 lb8,070 lb$42,790
  • 2018Introduced, replacing the 321THR12
  • 2020Length 37'1" to 37'3"; UVW 7,880 to 8,070 lb
  • 2021Dropped
FINDING ONE

Findable: a few listed nationwide most weeks. Why: KZ is a volume manufacturer. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

13-foot garage in a 102"-wide body; the 10,000 lb GVWR leaves under 2,000 lb once the trailer is loaded.

OTHER SPORTSTER FLOORPLANS
18TH · 7,000 lb · sleeps 4190TH · 7,000 lb · sleeps 4210TH · 7,000 lb · sleeps 6211THD · 7,940 lb · sleeps 6220THR · 7,000 lb · sleeps 6229TH · 7,000 lb · sleeps 422X · 12,000 lb · sleeps 626X · 12,750 lb · sleeps 6270TH · 8,800 lb · sleeps 6270THR · 10,000 lb · sleeps 4280THR · 8,800 lb · sleeps 6290THR · 10,000 lb · sleeps 8300THR · 10,000 lb · sleeps 6301THR · 11,000 lb · sleeps 8the whole line →
Find one for sale

Live listings for the 321THR13 on the big marketplaces. Each search opens pre-filled with this exact floorplan:

RV Trader ↗Camping World ↗FB Marketplace ↗Google ↗

Inventory varies by site and day. Slim pickings? search the whole Sportster line ↗

Is the 321THR13 your #1, or just a spec sheet?

These are the facts. Whether it beats the other six thousand rigs for you depends on what you care about. Set your priorities as sliders, switch on your hard limits, and watch the whole market re-rank around them. Every exclusion explained, every margin shown.

See where it ranks for you →

Data compiled from manufacturer spec sheets, retrieved 2026-07.