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I happened to be laying under my vehicle when this post popped in so grabbed some pics and measurements.Hi Jean, If using the bottle jack, I found this heavy duty attachment to place on top of the bottle jack in order to jack up the Grenadier from it's axles. It's called a "Bottle Jack Budy". There are 2 versions,
one for a smaller radius axle and one for a larger radius axle, which perhaps the Grenadier has.
This link is if for the one that would fit a larger radius axle, which may fit both axle sizes. Looks like something to add the the ever growing list of things to buy. DaBull
https://bottlejackbuddy.net/the-big-one-1
The axle housing tube front and rear is 265mm circumference which is close enough to 84mm or 3 5/16 inches diameter.
Being a multilink and coil setup there's not much room outboard to put an adapter due to the various mounts. There is no clear axle tube until about 450mm/18 inches in from the wheel. Still enough to raise a wheel but it puts you a fair way under the vehicle to operate the jack.
I probably wouldn't buy an adapter ahead of getting your vehicle. Then I would spend some time underneath looking for a spot you could use it at all four corners where it won't get hung up on the brackets.
A recycled leaf spring saddle will get you a long way towards a solution. Just needs a short sleeve welded on the back to sit over the jack.