Jayco Jay Flight Bungalow · 2021–202440FKDS

The Jay Flight Bungalow 40FKDS is one of Jayco's Jay Flight Bungalow destination trailers, the largest and most residential end of the Jay Flight range, built to be parked for a season rather than moved every weekend. This page covers one model year of it — the 2024 40FKDS, exactly as Jayco published it — because the numbers that decide whether your truck can pull this trailer are not the same from one year to the next. Jayco publishes it at 8' 6" wide closed and 14' 0" with the slide-outs run out for the 2024 model year, which is the measurement that matters for a site pitch as well as for the road.

For the 2024 model year Jayco published a 13,000-pound GVWR on a 10,510-pound dry weight, 2,490 pounds of published cargo capacity, a 1,600-pound dry tongue weight. That dry tongue is 15% of the dry weight, above the 10–15% band conventionally quoted for a bumper-pull trailer. Tongue weight is not fixed — it moves with how the trailer is loaded, and weight added ahead of the axles raises it. A tongue load in that range wants a weight-distribution hitch, and the tow vehicle's tongue-weight limit is a separate number from its trailer-weight limit — check the loaded tongue against the hitch receiver's rating and the vehicle's payload, not against the tow rating alone. The 2024 trailer left the factory on ST235/80R16'E' tyres; the load range in that code is part of the axle rating and a replacement set has to match it.

Against the 2023 build of the same floorplan, 5 published fields moved. The full comparison is in section 02, and it is drawn from two separate verified factory records rather than from one record and an assumption about the other.

A 2024 trailer is close to current as of 2026, but section 05 still applies: check it against its build date rather than its model year. Jayco commonly builds a model year well before the calendar year turns, and the tyre date codes have to be read against the build month, not the badge.

How the 40FKDS differs from the other 122 Jay Flight floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2021–2024). How these ranks are worked out.

• Dry tongue weight, 1,600 lb: fifth-heaviest of 122, between the 40LOFT (1,595 lb) and the 404LOFT (1,610 lb).
• Dry tongue weight as a share of dry weight, 15.2%: seventh-largest of 122, between the 34RSBS (15.1%) and the 197MB (15.4%).
• Length, 41 ft: seventh-longest of 123, between the 40LOFT (40 ft 10 in) and the 402DLFT and 40DLFT (41 ft 6 in).
• Dry weight, 10,510 lb: ninth-heaviest of 123, between the 402RLTS (10,485 lb) and the 40RLTS (11,560 lb).
• GVWR, 13,000 lb: ninth-highest of 123, between the 402RLTS (12,200 lb) and the 401LOFT (13,400 lb).
• Cargo capacity, 2,490 lb: shared with the 29RLDS; of 123, 113 smaller and eight larger, nearest the 34RSBS (2,470 lb) and the 38BHDS (2,600 lb).
• Interior height, 8 ft: shared with the 263BHSW, 401FLTS and two others; of 123, 112 lower and six taller, nearest the 200MKS, 200MKSW and 77 others (6 ft 9 in) and the 255THW (8 ft 5 in).
• Exterior height, 12 ft: shared with the 401FLTS; of 109, 97 lower and ten taller, nearest the 335BHS (11 ft 4 in) and the 402RLTS and 40RLTS (12 ft 1 in).
• Grey tank, 78 gal: shared with the 240RBS, 240RBSW and nine others; of 118, 104 smaller and two larger, nearest the 333BTS, 334RTS and two others (71.5 gal) and the 263BHSW (80 gal).
• Cargo capacity as a share of GVWR, 19.2%: twentieth-smallest of 123, between the 263RBS (19%) and the 240RBS (19.4%).
• Sleeping capacity, 4: shared with the 130BH, 130BHW and 23 others; of 110, five smaller and 79 larger, nearest the 140TB, 140TBW and three others (2) and the 174BH, 212QB and four others (5).
• Fresh tank, 53 gal: 42nd-largest of 123, between the 200MKS, 210QB and 48 others (52 gal) and the 200MKSW, 225MLSW and thirteen others (76 gal).

Next to the 402RLTS (2027 page), the nearest lighter floorplan by dry weight, the 40FKDS is 25 lb heavier by dry weight, has a GVWR 800 lb higher, has 775 lb more cargo capacity, has a dry tongue weight 230 lb lighter, is 6 in longer, stands 1 in lower, has a fresh tank 1 gal larger and has a grey tank 45.5 gal larger; the two publish the same interior height, black tank and sleeping capacity.

Next to the 40RLTS (2021–2026 page), the nearest heavier floorplan by dry weight, the 40FKDS is 1,050 lb lighter by dry weight, has a GVWR 500 lb lower, has 550 lb more cargo capacity, has a dry tongue weight 30 lb lighter, is 8 in longer, stands 1 in lower, has a fresh tank 1 gal larger and has a grey tank 45.5 gal larger; the two publish the same interior height, black tank and sleeping capacity.

This floorplan has a published factory record for 3 model years here, 2021 to 2024. The specification does not hold still: dry weight runs from 10,510 lb (2024) to 10,785 lb (2021); dry tongue weight runs from 1,435 lb (2023) to 1,600 lb (2024). The published sleeping capacity changes across the years: 4 in 2021, up to 4 in 2023–2024. Each year’s complete record is printed separately below, carrying only that year’s own published figures and source. Nothing is copied across from a neighbouring year.

Jayco changed 5 of the published fields between the 2023 and 2024 40FKDS. Every figure in both columns is that model year's own factory record — nothing here is carried across from the other year.

A full 53-gallon fresh tank is about 440 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 18% of the 40FKDS’s 2,490 lb cargo capacity, leaving 2,050 lb (513 lb per rated berth). Across 123 Jay Flight floorplans the water share runs 13% to 47%, and 120 give up more than this one. Nearest on that share: Jay Flight 183RB at 16% and Jay Flight 236TH at 18%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).