Which rear wheel pulls on my 2002 Nissan Frontier rwd
Wanting to make a sand bag to put over rear wheel that pulls for up coming
It doesn't work like that. If you have an open differential, when a tire loses traction it will spin. If you put weight over the right wheel( the one that usually spins in slippery conditions) the other wheel will have less traction because of weight bias. So your truck will probably spin the left wheel. your best bet is to evenly load between your wheel wells. I would build a wooden frame that locates the load in the middle so it can't slide on acceleration or braking.
Install a locking or limited slip differential.