you may have water (ice) in the rear drum. maybe put your heater on it and take loose the drain nut on the bottom of the drum. i know that if water does leak in it and you park with the brake on and it freezes, the brakes can freeze in position.
We had an awsome time. Lots of challenges due to the snow, ice, water and bog. we are supposed to get a few more inches of snow today so hopefully I'll get a chance to try out the mud lites in the snow.Looks like you had a great time,nice pictures.Is it the foot shift lever that won't move?