There has been alot of info put on this site about different shocks. I think everybody here knows that i am a fox shock person, I am sure there are other good shocks, but i know the fox shock is a very good and reliable shock, i do not know the others. With my trooper it does not matter how i drive it, wether it is like a idiot or just putting around with the wife, it does very well. The fox 8" shocks fit with out alot of modes on the rear, the front is alittle more difficult because the trooper does not set there front ends up with the right shock geo. I do not run any limiting straps on the front or rear, this lets the springs work in there full cycle. I have over 14" of travel in the front and rear. I am sure you can buy a shock that will bolt in, but if you do the suspension will not be right. Almost anything is better than what comes stock on a trooper, as far as air shocks there is no way i would do that, i think when you are on a side hill it would be bad news, the high side would be trying to flip you, and the low side would be helping. It cost more for good shocks but is well worth it, take your time and get what you want. Race desert.com has alot of good deals on shocks, I just like the fox shocks because they have always been great and had no problems. the coil overs are the only way to go, no ifs about it.
350 over 400 on the front, 8.5 fox shock
400 over 600 on the rear, do not go any softer on the springs. 8.5 fox shock
No resivours, you do not need them.