Do you need a cdl a to haul RV trailers commercially with a 1 ton truck?

If the GVW of those trailers exceeds 10,000 lbs. and the GCW of the entire combination exceeds 26,000 lbs., yes. A current production one ton truck typically has a GVW of around 13,000 lbs. So any RV trailer with a GVW in excess of 13,000 lbs. will require a CDL when being hauled on a commerce basis.