I want to tow a 4 door pickup with a bike loader and bike

99% of your GM 4 door full size 4x4's are towable 4 down, as are many of the Ford and Dodge 4x4's. Pick the one you like, check the owners manual under "RV towing" and you will know for sure. Just make sure the bed is proper length to mount the loader and that the truck has sufficient load capacity for both the loader & bike. We tow a full size truck behind ours and it may have either a full size bike or a SxS in the bed. The DP handles the weight well.