2026 Forest River Cascade39TNC

The Cascade 39TNC has 4,255 lbs of cargo capacity between 8,885 lbs dry and its 13,140 lbs GVWR, 32% of that rating; filling its 40-gallon fresh tank at 8.3 lb a gallon uses 332 lbs of it (how to read trailer weights).

Tongue weight is 1,140 lbs, 13% of the dry weight as published; it rises as the trailer is loaded and counts against the tow vehicle’s tongue-weight and payload limits (tongue weight by size).

Off hookups: 80 gallons of grey and black capacity against 40 gallons of fresh water, so fresh water runs out first (tank sizes by length).

Against the rest of the Cascade roster this is the 15th of 16 floorplans by dry weight, in a line that runs from 2,604 lbs to 11,327 lbs. It sits in the heavier third of the line.

Plan the tow on loaded weight, not the 8,885 lbs dry figure: half the published cargo capacity brings this plan to about 11,013 lbs, and the published GVWR of 13,140 lbs is the limit (how to read trailer weights).

Forest River’s line listing and this floorplan’s own factory page agree on all 4 shared figures. Dry weight plus cargo capacity equals the published GVWR exactly. A missing row means Forest River does not publish that figure (how figures are verified).

Forest River publishes no floorplan description for this plan in the channel this page is built from - only the numeric specification block. Rather than describe a layout from the floorplan code, which would be a guess dressed as a fact, this page carries what the factory publishes and says where it stops. 39TNC is a Cascade designation and this site does not decode it into a layout claim.

How the 39TNC differs from the other fifteen Cascade floorplans. Most distinctive first. How these ranks are worked out.

• Cargo capacity, 4,255 lb: largest of sixteen; next is the 29TEC (3,052 lb).
• Dry weight, 8,885 lb: second-heaviest of sixteen, between the 20OGC (8,349 lb) and the 39DLC (11,327 lb).
• GVWR, 13,140 lb: second-highest of sixteen, between the 20OGC (11,210 lb) and the 39DLC (13,342 lb).
• Cargo capacity as a share of GVWR, 32.4%: second-largest of sixteen, between the 14BHLPC (31.8%) and the 26LPC (39.7%).
• Tongue weight, 1,140 lb: second-heaviest of sixteen, between the 20OGC (1,010 lb) and the 39DLC (1,342 lb).
• Length, 40 ft 7 in: second-longest of sixteen, between the 301BHC (37 ft 3 in) and the 39DLC (42 ft 8 in).
• Exterior height, 12 ft 9 in: third-tallest of sixteen, between the 301BHC (11 ft 1 in) and the 20OGC and 39DLC (13 ft 6 in).
• Grey tank, 40 gal: largest of sixteen, level with the 20OGC and 39DLC; next are the 23MSC, 26KFC and five others (38 gal).
• Black tank, 40 gal: largest of sixteen, level with the 20OGC and 39DLC; next are the 23MSC, 26KFC and four others (38 gal).
• Tongue weight as a share of dry weight, 12.8%: shared with the 27LHC; of sixteen, twelve smaller and two larger, nearest the 29TEC (12.7%) and the 23MSC (13%).
• Fresh tank, 40 gal: shared with the 20OGC and 39DLC; of sixteen, six smaller and seven larger, nearest the 14BHLPC, 17LPC and two others (26 gal) and the 23MSC, 26KFC and five others (52 gal).

Next to the 20OGC, the nearest lighter floorplan by dry weight, the 39TNC is 536 lb heavier by dry weight, has a GVWR 1,930 lb higher, has 1,394 lb more cargo capacity, has a tongue weight 130 lb heavier, is 4 ft 11 in longer and stands 9 in lower; the two publish the same fresh tank, grey tank and black tank.

Next to the 39DLC, the nearest heavier floorplan by dry weight, the 39TNC is 2,442 lb lighter by dry weight, has a GVWR 202 lb lower, has 2,240 lb more cargo capacity, has a tongue weight 202 lb lighter, is 2 ft 1 in shorter and stands 9 in lower; the two publish the same fresh tank, grey tank and black tank.

Cascade covers a wider span than any other Forest River travel-trailer line this site has catalogued: thirty-three published floorplans in five factory groupings - single axle, tandem axle, tandem-axle toy hauler, fish house and destination - running from 2,604 lb dry at 17 feet 3 inches to 11,327 lb at 42 feet 8 inches. Tongue weight runs 320 to 1,342 lb over that span. The grouping a plan belongs to predicts its class far better than its floorplan number does, so both are in the table below.

A full 40-gallon fresh tank is about 332 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 8% of the 39TNC’s 4,255 lb cargo capacity, leaving 3,923 lb. Across 16 Cascade floorplans the water share runs 8% to 32%, and this plan’s is the lowest. Nearest on that share: Cascade 20OGC at 12%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).