Looking to buy a diesel pusher - How big is too big???

Thanks for all the advice and info... It got me to looking up restrictions - we intend to spend a lot of time in Alaska which means going through Canada... Maximus length everywhere except Yukon is 12.5 meters or 41'6"...

We also want to tow a Jeep Grand Cherokee. Approximately 33 states have 65' combined length restrictions as well.... Dang. What an eye opener. Glad you all are giving me things to consider. I would have completely missed those two important points.... You all are the best.