After my Jack fiasco a couple of weeks ago I purchased a hydraulic bottle jack for a replacement.
A 6 ton bottle jack will fit perfectly in the factory space … do yourselves a favor and upgrade
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Do they lift enough? When I use bottle jacks for stuff like that I often find they don't have enough travel as the suspension decompresses, especially if they are sinking into the soil. Maybe also add a stack of blocks in addition (you may have those already).