We're full timers in a 40ft Fuzion T/H, high off the ground. We found that by placing 6-7 Linx Levelers (giant orange Legos) under the pads of each sissor jack in the back so the jacks don't have to extend as much, along with our pin-box tripod, it makes things pretty stable, so you'll just have to experiment. You can use wood blocks but the Linx product is much more convien. I'm taking it on faith that you have four stabilizing jacks already, one on each corner yes? You don't have a pin box obviously, but when I had my TT, I put two extra alum jack stands under each arm of the hitch A-frame up front about 2/3 back from the ball socket, which stabilized it nicely. CW also sells portable cross braces if you want to go that route, and they work very well, but they're a hassle unless you're going to be somewhere for a long time. Also keep your tires aired to max pressure as indicated on the sidewall(s). Hope this helps. Have fun.