Extra height and a RV or extended tongue are mandatory for me. Mine is 20' long 8.5" wide and 7' interior height. I was originally looking for 16', found a heck of a deal on a used 20' and wish I had 24'.
I am also a big fan of the torsion axles over the leaf springs but it wouldn't be a deal breaker. Mine is a Carson trailer and it has served me well. If cost is not an issue I would buy a featherlite trailer 24' long, 8.5 wide, and 8'tall.
I am not very familiar with WDH and got a hand me down to use with my trailer that had bars that were lower than the trailer tongue. My trailer tongue sets too low. I would have scraped trying to go over a speed bump.