I would go with something under the floor in addition to the jacks if you can. If your car isn't too wide maybe a couple of 4x4's across the floor to saw horses or other supports that run paralell(sp) to the camper and thus your car hood. While the jacks should hold it up without issue weight wise they do not allow much torshional(sp) support if you bump the camper with your car or floor support if you need to get into the camper. Allow me to highjack your thread. For the technologically challanged, which I consider myself a group member, what happened to the spell check on here? How do I turn it back on? Anyone want ot post a helpful note?
Let us know what you come up with.