I wouldnt do 80 down the freeway with mine.
I just finished mine recently and going 40 on the street with 5 psi in the tires felt safe as before but today I aired up to 36 psi and just went around my neighborhood and it felt MUCH looser and like it MAY be unsafe at highway speeds
just my .02
85 Runner, 5" All-Pro Extreme Lift, Complete Marlin T-Case with new TS 4.7 gears, Super Birfields(Longfields), 5:29's, Detroited front, Spooled rear, 36" TSL's, Bikini top.
Yes, Livin in Kansas sucks azz!!