The only timeI needed low box in our sj413 was when towing out other vehicles. I even managed to dead tow montego estates and a fiat panda 4x4 several times. Did you air down your tyres. That makes the biggest difference. 15 psi worked fine most of the time but the montego's needed 10, being 2wd. It's not the width of the tyre that changes much, it's the length of the footprint. (don't drive off sand with deflated tyres though, they may delaminate or explode) we each broke the bead on tyres by hitting bumps too fast with low pressures but they can be easilly re-inflated.
If you can drive the dunes in a renault 4 (which you can) then a suzuki should present no problems, but the old adage of knowledge experience and skill being more important than equipment holds true. Beady, one of the montego drivers who is a hill rally winner and former paris dakar support driver only got stuck once on the piste.
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1990 Landcruiser H60. Full rebuild completed 2014
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