Some very good and helpful info there.  I will have to ask the rep about the difference in the units (there is a factory rep on forest river forums) and about 16" tires as it appears 15" are standard (per the brochure).  For the truck we had to scrap the diesel plan and go gas because the wallet just isn't allowing us to do all of that.  In an ideal world we would be getting a diesel and this floor plan in a 5er but that's ok.  We have been talking 1 ton vs 3/4 ton.  Real world weights (from trucks tire stickers on the lot), on the LT version of the 2500 silverado do have a 2900 available payload but I'm not sure of available RAWR and the TW specs aren't listed.  If TW or RAWR are going to be an issue even if payload isn't then I will go 1 ton.  Honestly identical trucks in 3500 and 2500 priced out approx $1000 differently on website.  We currently have 3/4 ton diesel with just under 1500 lbs payload and lots of mechanical problems.   Will post pics when the new rig comes home.  Thanks.