I just purchased a 78 Hi Lo 25ft. It hasn't been moved in a few years and the tires are sunk in the ground a little. After going through several threads, I found that jacking up the Hi Lo can damage the frame. This was mostly noted on leveling the camper. I want to try to jack up the camper enough to get some 2x6x8 under the wheels to aid in pulling it out and check the tires and see if they are locked up. Can I put a floor jack under the main frame supports and jack it up safely. I assume that I can, but want to make sure. This project is going to be an adventure.