Just a note on Bottle Jacks. I have them too and used one in my driveway to replace a flat tire on my camper. I had to jack the camper up so high to get the tire off that it tilted the camper. First attempt failed. The jack kicked out before it was up high enough to get the tire off and the camper came crashing down. Fortunately, there was still one good tire on the camper so it made a big noise but no injury and no damage to the camper. I only mention this to be very careful using bottle jacks on campers. There's only about 1" of contact with the camper frame and top of the jack. Now I have those curved ramp things to raise the camper if I ever need to change a tire again.