So far, I've found it pretty easy to level by using a 1' level to estimate how many 5/8 pieces of plywood I need under a wheel to level side to side. Then I use the tongue jack to level end to end. I've been pretty good about estimating the plywood pieces so far. A 1/8" gap would mean I'd 2 boards under the low side, done just before unhitching the TV.
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