The paddle-nuts are difficult to install but that is to be expected, and the upper bracket and frame alignment holes (one on each side) had to be opened up with a drill to accept the mounting bolts. The 'U' bolt nylock peened nuts were most difficult to install. They threaded on extremely tight. If I were redoing the install I'd purchase different nylock nuts. The bags, and fittings worked as they should. I've installed and been testing air retention under pressure for 5 days and there appears no leaks. I'm a 13 year user of rear air bags on F-150s.
Took about 3 ish hours to install with simple tools. Raised the rear of my truck an inch with only 10psi in the bags. Haven’t hooked a trailer on yet but can tell that the bags helped sturdy the ride even with only 10psi in them.