Originally Posted by wincrasher
You'd have to check the ratings to see - he may be suggesting that payload is much higher, but GCVWR is lower, because of the overall higher vehicle weight and using the same engine that comes with the lighter truck.
I found that in the 2500, the gas model has higher payload, but will tow less overall weight.
I think that is exactly what he means. Also towing capacity is about the same on all the HD trucks across the spectrum based on engine/trans/rear specs regardless of wheels. It is the GVWR of the truck and so the available payload that determines whether a particular truck can tow a particular camper.
For example my 2008 GMC 2500HD Duramax has a "book" 5th wheel towing capacity of 15,800 pounds (nearly same as their 3500HD SRW and 3500DRW at 16,500 pounds). However the mediocre GVWR of 9200 pounds and the remaining available payload (after family, hitch, generator and spare fuel) of 1500 pounds limits my 5th wheel camper size to 9400 pounds.
The 3500HD SRW and DRW has a trailer capacity of 16,500; just 800 pounds more. What changes is the available payloads. The SRW GVWR is 9700 pounds and the DRW GVWR is 11,400 pounds.
To be fair, the newer GMC/Chevy 2500HD trucks have GVWRs of 10,200 pounds due to a frame change ("C" to BOX) in 2010.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW