Iirc, a 2500 GM van is a 6 lug 7200 GVWR. I could be wrong. If as the birdie in my brain is going off, you would probably have the 4.8 or 5.3 in it. If it is an 8 lug 2500, you have a 6.0 V8.
Reality, ANY of those motors will move that trailer etc. My sons 1500 pickup with a 4.8/4L60 trans/3.42 gears moved my 5400 lb C2500 with his car hauler at a bit over 2000 lbs just fine. Yes some of the 3% freeway grades had him in the low 50mph relm in 2nd gear. Frankly to be expected, as one would need the 200-250hp that motor is producing at the rpm it was running in 2nd.
A 5.3 or 6.0 would be a bit faster, but still turning 4000+ rpm in 2nd gear. No overheating etc.
My 02 in this.
Marty
