We have a full wall slide that I wouldn't dream of deploying if the coach isn't leveled first. If you twist that thing wrong one time I'm guessing it will be nothing but problems then. I have camco leveling pads with metal handles on them, I put a few blocks of wood on each one before I slide them under the coach. I usually try to stack enough on them to be within an inch or two of the foot. Although mine are only about 4-5 inches off the road anyway. I find that the MH has much less rocking if there isn't so much of the hydraulic ram coming out.