If you are talking about running sand dunes....
I suggest wider rather than taller tires, also with an all season type tread, not a mud tire, you don't want to shovel those tires down into the sand, very hard to get out
Lift it up, put some wide low to medium profile tires on it, say like 275/50's if you can... probably only available in street tread, but the Kj is kind of heavy so you need a big foot print on the sand. I'd also suggest an on-board air system so you can lower and RAISE your tire air pressures, lower pressures on the sand, like upper single digits if they are stiff, or in the teens if they are soft tires, this will help the tread grab the sand, and also cup it under the tire rather than displace it and dig down.
You could consider making a sheet metal belly pan, front to rear, like one big skid plate, just to keep the sand from catching hold of parts underneath and slowing you down.
Also might consider running a high performance muffler so you can drop your torque a little, low rpm torque will probably get you dug in.
Definitely get a front end skid plate, or make one out of sheet metal, to keep sand from getting into engine bay.
Make sure you have reliable hooks front and rear, or aftermarket metal bumpers with recovery points on them (the weight might be an issue, as you don't want to get a whole lot heavier driving in sand.
I'd also recomend for a vehicle that operates in high temperature areas... remote oil filter with an oil cooler (this will add a couple quarts to the system, and help it keep cool), an auxillary ATF cooler, used with the stock one, not instead of it (again, increased capacity and better cooling), and pick up an auxillary oil cooler and plumb it into the return (low pressure) line for your power steering (added cap, and cooling), overheated steering fluid can be a real pain in the butt! it will cavitate and foam up more easily, reducing it's ability to move through the system.
If you get metal bumpers: A high lift jack is a very tricky thing to use in the sand, you will want to get the hilift foot base, or carry a 1" thick plywood foot by foot square with you (might need to reinforce it with a couple 2x4s on the bottom).
If you keep the plastic bumpers: make your self some sort of a cup to weld onto a bottle jack that can lift on your tow hooks, and again, use a plywood and 2x4 base to keep it from sinking. you could also use a floor jack for this, but that takes up a lot more space inside the jeep, and needs a larger base to hold it.
Recovery strap... don't get a tow chain or a tow rope, only get a high weight limit, 30-50 foot snatch strap. this strap stretches to give a rebound effect that creates a stronger pull than just a rope alone, and also with the stretch effect it is less likely to get the rovery vehicle dug into the sand