Top Class Bs for towing?

I enjoyed reading this thread about the top three Bs ( Top three Class B). Since it only focused on build quality I wonder if or how the list would change if you added the variable of towing into the mix. I am searching for a B to pull my boat for short camping/fishing trips. I had PW Lexor and regret selling her and we are back to searching. My wife likes the looks of the vans (PW Lexor or Roadtrek Popular 190), while I like the PW Exel or RT 210 sizes or even the Winnebago Travato if only they weren't V6 w/ only 3500 tow capacity. So lets hear it, how would you rate them for towing? Thanks.