We aren't suggesting you leave the gear out. Once you roll the trolley out you raise it off the wheels until you have finished for the night.
If there is enough space under the buggy you could use a scissor jack like you find in many cars to lift it far enough to put bricks under. Jack one corner at a time. You could use a length of timber/lumber as a lever but you would probably need two people.
Levelling bolts you wind down when you start and up when you finish. A suitable size ratchet spanner and neither the weight nor having room to swing it should not be a problem.
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