So my 05 Winnebago Aspect 26a on an E450 chassis (1.5 ton) has a towing capacity of 5000 lbs/350 TW. With my enclosed trailer and 3 bikes, i'm at the limit. Also with my SxS in an enclosed trailer. It seems fairly common to have the rear subframe/frame extensions reinforced and a higher rated hitch installed......Very popular in the drag racing scene with people pulling 20'+ enclosed trailers with their RV's. Anybody have lst hand experience doing this? Any tips or pointers? Maybe understandably, but I can't seem to find an "RV" place to do this, so a professional welding/fab shop would have to do it. There's all kinds of room and looks fairly straight forward. ' motorhome subframe beefup' on youtube shows this at TORKLIFT in Washington St. A bit far to drive from Ohio. I understand the legailites of towing over the specified tow rating of the RV, etc....Having the work certified is beneficial in this case. I don't plan on towing over 5000 lbs necessarily, but being at the limit and hitting bumps, uneven transitions of pavement at bridges, etc, could create some damage over time. Just trying to be proactive and give myself a little peace of mind.