Does the bed have some weight in it?
Got a source for landing mats or even 4 2x8's (6' long) with a bunch of 1-1/2" hex hed lags can be laid on the ground and leap frogged back.
Handyman jack can be used for a winch with cable or chain.
Tire chains if you can find with crossbars best for more bite. I suspect issue is weight needs to be added., Mabye air down the tire pressure a little too to get more contact area.