A rear locker or limited slip diff running Redline Heavy duty Shockproof gear oil (isuzus) will lock up rear end and significantly improve traction. Huge improvement - had this on all my club trucks, plus front locker at times.
The other key thing to do for easier travel over sand is lower your tyre pressures to widen tyre footprint. Whereas you might normally run tyres on road at 32-40lbs, lower them on sand to 20. Big difference. Some boys even run them down to 12-15lbs but then you must be careful not to spin tyre off rim. For this option you need a little plug-in tyre inflator pump..pretty cheap.
Lowering tyre pressures to say 25 something we oalso often do say for lumpy terrain/river work - gives you a softer more rolling ride. Leave tyres fully inflated for snow/ice/slippery condition.
As for getting stuck up to the sills like that - this is called learning!
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