You are testing the breakover of the vehicle.
If you have a rear locker, getting by some of these are fairly easy. If you can go to it at an angle and get a front wheel over it and when your rear wheels approach turn into straightening up the truck can minimize some breakover issues.
Instead of only have ground contacts for the breakover, you effectively created 3 by staggering when the front tires reach the crest.
In all honesty though, I don't think, in most cases, the inch or so you give up for good protection is going to hang you up any, especially on dirt. The piece of mind of having sound protection to vitals when you are off-road is of much more importance than 1 inch of clearance because you just never know.
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