To center it on the trailer track, you have to get on the roof or a ladder and remove the screws in the track holding the awning, deploy the awning just about to the end of the travel and then start moving the awning at the roof to get it centered between the arms, then go down to the roller, check that it is centered and repeat the process. Roll the awning up to check, unroll and if it is centered, drill new holes and re-install the screws in the track. Go to the roller and drill 3/16" dia holes in the top of the roller thru the hem of the material and install a large head pop rivet in both ends. Problem should be solved.