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First I run the front jacks out a couple of inches to make the front higher than level. I put the portable (floor or bottle) jack just behind the rear axle on the frame. The front jacks will hold the front end. You are not lifting the entire side of the trailer since some of the weight is on the front jacks. I only lift high enough to be able to rotate the wheels. Remember that the equalizer (between the axles) will let the heavier axle stay on the ground so you may have to use a second small jack to lift the heavy axle. Especially once the wheel is off one axle.
Cement building blocks are strong in one position and weak in other positions. If you place them just like building a wall with the holes up they are strongest. I have had them crush standing on end and on their side.
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