[LVPhotos]

This is reference pic. 35ft 5th wheel 1ton diesel. So if you are 5 ft longer on a bumper pull, Would say you dont have enough brakes. At 40ft most trailers have 3 axles. The tounge weight will be too much. Equlizer bar to keep it straight. I drove a 350 c50 tow truck with 4spd and 55 was top. Split rear gears not allowed to use per boss.
What does the blue gvw plate on kick panel say? My c10 is 5200.