I'm shopping for a 2500HD Crew Cab 4x4 Short Box, D/A. The brochure lists the payload for a "base" model at 3342 lbs. If you consider an LS model with the D/A, what is a more realistic figure? I tow a fifth wheel with a pin weight of almost 1800 lbs. Does a truck like this weigh about 7000 lbs? If so, that only leaves 2200 lbs before exceding the GVWR. I wish they made the one ton with SRW in a short box. Think they will in 2005?