I have exactly the same issue. My standard bottle jack won't reach the axle.
I use a solid brick underneath the jack. I have practiced on my driveway and it works for me. I've also used a very thick piece of wood under the solid brick.
I make sure the jack is in the middle of the brick/wood, so that the weight is distributed evenly.
Soft sand can be a problem. The other option could be an exhaust jack - it's light and folds down. Be careful of the exhaust fumes.
I'm not a fan of high lift jacks. If you don't know what you're doing, they can seriously injure or worse, or your troll may end up falling and bottoming out on the ground.
What ever you choose, make sure you do it safely.
Rossco
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