I have 6 G614 on my TH, all at 110psi. Last time I scales it the trailer axles totaled 12k, with close to 22k of tires & rims. For what it is worth, slam the electric brake controller at low speed, and you will eat dashboard in my truck. I have NO problem with traction at max tire pressure. As far as rough ride on the trailer, the axles likely have a rough ride, but the centerpoint suspension on the trailer absorbs almost all the bumps before they hit the frame. Between the centerpoint, and trailair triglide, the truck feels RR tracks, but you can't feel the 3 trailer axles cross them.