Looking to buy a travel traler. On the side of the TT's I see a sticker with the accronym GTRW. I can't seem to find out how much of this I can tow with a basic chevy 1500 or Ford F-150. Just how much can a Chevy Silverado V-6 tow? is it 3,000lbs, 4,000lbs, 7,000lbs; what is it? Thanks, J.K.