A little bit depends on where you plan to start your North American adventure. Florida ? Texas ? Arizona ?. Ease of finding suitable storage could come into play, if you plan to store back where you start. Personally having had a 5th and now a Class A ; the A in my humble opinion , would be much easier for a new owner to drive and park. 4 , 5ers and I never got really good at parking , at least according to my wife.
If you go class A will you be towing a car ? or renting at your longer stops ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.