Unless you have hydraulic jacks the only way I can see this being done is to manually jack up each side of your trailer and use cement blocks under load points. On the other hand, I live in my Camer 5er 7/360 and the tires are still on the ground, but I do have the leveling jacks taking some weight off them. What I would recommend is take some plastic table place mats and put them under each tire (bring your RV over them) separating the ground from the tire. This will prevent leaching tire chemicals to the ground. I do this while camping also. In addition cover the tires or keep clean and spray some tire Shine on them to protect the sidewalls from UV.