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Its pretty critical, especially when you have low range 4WD. But if you're a poorfag and cant afford a 4WD van my recommendation would be to get a van with good ground clearance & a RWD solid axle (Like a Ford E-series). Then Install a rear lunchbox/Detroit differential locker (can be bought for less than $500 new) and some good off road tires in a slightly larger size(31" or even 33" BFG KO2s would be good, also get them as wide as possible 10.5" at least) and then a portable air compressor to be able to air down your tires off road for even better traction, then once you're back on the pavement you just air them back up. Not even shitting you OP those 3 things right there will get to like 90% of the places a stock open diff 4WD will take you on most BLM trails. I'd even go as far as saying that a Locked rear diff with good tires that have been aired down to the correct PSI will be more capable than an equivalent open diff 4WD with fully aired tires. Off course there are certain obstacles where you just need 4WD and so you just have to know your limits but unless you plan on doing some crazy trails I'd say a rear locker, good tires and proper wiring down will get you almost everywhere you need to go with proper driving & planning.
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