That's just what truck campers do. I doubt any shocks will make a big difference. If you are like myself or my wife, you will get used to it - to the point that walking on solid ground feels weird after a longer camping trip.
As said above already, you can lower the rear jacks to the ground when parked to stabilize the camper.
If you want to play it absolutely safe, disconnect the turnbuckles when you do that. That way, if a tire should go flat while the jacks are on the ground, your truck would not hang from the camper.
Do not forget to retract the jacks and fasten the turnbuckles when you leave.
