Confused at Camping World

I understand that the TT will not be running at the dry weight. They were using the GVWR in the calculation which i understand. I thought I could hear from a camping world person to see what they say about the discrepancy. I would also like to hear from some who tow with a 1500 yukon xl or suburban to see what they have to say. I am just trying to do my research on what I can tow. I don't want to buy something I can't stop or control. Like I told the salesman, I would much rather go lighter and less room and be okay then get more room but running at max. Right now we found a 5680lb dry weight 26' bunkhouse. This is also posted under the travel trailer section. Thank you for all your help.
bill