ARB Lockers

I've had every locker and limited slip except the Gov-Loc, and the OX Locker. They all have their plusses and minuses. I ran ARB's for 20 years in my rock crawler and they worked fine. But, they are not trouble free. They do require maintenance and you need a repair kit for those times. The main drawback of the ARB is the high cost for what will be .002% of your drive time. For sand, as above, you really don't need a locker unless you get the axles twisted up enough to get a very unequal ground pressure or a wheel off the ground. The chances of that happening with a 11K pound truck camper is low unless your suspension is too stiff and unbending. Seasoned TC-ers depend on dropping the pressure in the tires in sand to get what you really need: Floatation: spreading the tire's footprint over a much larger area with less ground pressure. I've used very wide tires, 375 x 15.50R 16, a kind of super single with 12 inch wide rims on the rear axle and lowered the pressure until the ground touching patch was 18 inches wide and 14 inches long @ 20 pounds of air to get over the dunes. Here's an unmounted comparo: 285x75R16 v. the beast:

At that time I had only a tightly loaded Power Lok, clutch type limited slip in the rear and that was plenty enough. Almost 2 years ago I did a complete front axle overhaul and upgrade on my Dana 6O, adding mostly Dana 70 parts and locking hubs, converting to Tru-traks, front and rear. They are all gear driven, no clutches; torque biasing, which means they send the available power to the wheel with the most traction; automatic. They work great for what I need them for and are completely transparent....until you need them. There is no jerking or 'loading' of the drivetrain at all. Compared to ARB's, they are about 1/3 the cost.
Just hours ago, I came west over I-80 from Reno to Casa jefe in my TC, driving most of the time in 4WD and a lot of snow on the road. Full pressure/AT-3/ 35 inch tires/nothing to turn on or adjust. It was a pleasant experience.