I was wondering too, about the differences in the Heartland 5th wheels..We looked at every size and type of Heartland..We have a 2012 Dodge diesel so pulling one wasn't a real problem.We finally decided on a 2013 XLT 287RL...At 33 feet 6 inches and about 7500 pounds , it is very easy to tow..Now am wondering if I should have gotten the regular Sundance..Heavier , but more room and more spacious. The wife loves the one we have but I always agonize over whatever we buy..Norm and Pick..