Most of the screw type scissor jacks will support 5000 pounds, and I have a pair I use in the garage to pick up cars, and use for jack stands. The one leg style are just stabilizers. As for leveling, depends on your frame, length of the trailer, etc. Some longer lightweight trailers you may warp the frame, or twist it, so the story goes, by using the corner jacks to level. I have used mine, scissor style, to level the last inch or so. Your mileage may vary.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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