Probably depends on what system you've got. Mine says each jack is rated for 20k lbs. I have no problem lifting the front or back wheels off the ground with mine. I do have to build up with blocks of microlam LVL sometimes because they don't have a ton of travel, depending on the slope and such. Be careful lifting the back wheels off the ground if you're on a slope. The parking brake doesn't lock the front wheels so no problem raising them off the ground. But if you're on a slope and lift the back wheels off the ground you could slide on the jack plates.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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