Suspension swap

I have a 91 W900 triaxle dump truck that was converted from a tractor at one point prior to me owning it. It currently has an ag100 suspension which i personally really like but its not practical for what i use the truck for. I do alot of blacktop work and the bags make the body sit too low in the paver to be ideal for it. Also, I notice i get alot of hood flex as well whenever i make a tight turn, to the point to where it breaks the rubber hood latches.

My question is: is there anything I can do to up the pressure in the bags so the bed will sit higher? Or is there another suspension that would more or less bolt into the factory holes in the frame? Im trying to avoid cutting the frame to put a cutoff in as my frame is a double frame already and extreamly clean for its age. Any input is appreciated.

Thank you

 

The mounts are good, and i got 24.5s in the rear and a 22.5 up front