If you trust an bottle jack then why not the level-up.The level up has more than enough capacity to jack up the rv. Just be sure to use blocks under jack pads for stability and never obligate your body. Use enough blocks so as the jacks don't have to extend so far to have tires clear the ground. I've greased my wheel bearings raising all 4 wheels at a time on concrete and have fixed a flat twice using the level-up. Bottom line is don't get in a hurry and raise the tires just enough to do the job . Common sense can go a long way here.
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