Have you considered polyairs, very good for such situations. I run these on our Defender and used to run them on our D2 when loaded up and towing a boat on holidays. I load level on a level surface using a tape measure before setting off and deflate again when we get back.
Be careful not to over inflate them though, we go to a maximum of 25psi and no less than about 8psi.
Erich


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