I have a 2001 Suburban and it didn't tow a 22 ft Wildwood with a 3618 lb yellow sticker weight very well. 60 mph highway and it was working hard. Freeway grades were slow. 2 lane roads 55 mph 3rd gear in tow/haul mode were OK. After a 4000 mile trip I traded the trailer for a smaller one that tows great. Wind resistance from the higher wider trailer seemed to be a big part of the problem.