please help.driveshaft support problem

i have a ext cab nissan hb and my center support bearring keeps tearing up.what could be the problem?i bought the truck to be my daily driver but im not able to because of this problem.any help would be greatly appreciated.

Depending on the rear setup, the driveshaft may need to be shortend or the bearing may need to be moved up higher. It just depends and there isn't a straight answer. Best bet is to get it on a lift and lift and lower the suspension to see what it is doing to the bearing. The tranny may need to be lifted too with the bearing.