Oh there are definitely some long ones 40' out there. I saw a couple at an RV show and I overheard a sales guy say, SURE your Ram 1500 can tow this!
Oh man, I wanted to Gibbs that idiot so bad, but my wife held me back. LOL
I had looked at the UVW and GVWR and that trailer sat there, empty at over 10,000 pounds. It was a 14K GVWR trailer. Not even a perfectly set up F150 with 13,200 capacity could tow that monster of a trailer. I just SMH and walked away.
Yeah, they are out there, really nice ones, but man that is one long trailer to tow, and even with a Dually it would be border line crazy, that is a lot of sail!