No issues at all with my ECO boost. I pull the TT in my signature without issue. Came home today after spending three nights at a state park. Pulling at 65 mph.......2000 RPMs.
My mileage has varied while pulling out TT. I seem to vary between 9.8 and 10.2 mpg.
Very smooth ride and very good power!
There is always "someone" who "knows someone" who "knows someone" who has had issues with the EB. I have yet to meet those with problem EBs. Not saying they don't exist, but I make it a point to speak with EB owners at campgrounds, each and every time.
Do be cautious and check both gearing and payload when looking at the trucks.
Good luck......hope you find something your happy with!