First drive on highway with 2.5" Revtek leveling kit installed. I had the 1.5" spacer block added in the rear and air bags. When I hit bumps on the highway it feels like the back end is going to kick you right out of your seat. No air in bags. Wounding if anyone else has this problem. The back end suspension seams to stiff.

Where do you live? Could be the highway.

Mine is not too bad.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI
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When you stand on the bumper and jump up and down the suspension barely moves.

Since you have helper bags on the truck, you could go with some much softer shocks in the rear. Smoother ride when empty and then air up when you have a load.