Rear axel adjustment

[ga-stepside]

I am putting the bed back on my ’67 step side. When I pulled the old bed off I notice scuff marks on the diver side bedside wheel well. There is less than a half inch clearance on the driver side and several inches on the passenger side. Do the rear trailing arms have locating pins at the axel like leaf springs do? Or can I simply loosen the u-bolts and slide the axel over about an inch to get equal spacing for the rear tires in the wheel wells? I have an adjustable trac bar.