I'd recommend going with air springs like the Air Lift LoadLifter kit part # AL57344 which is a confirmed fit for your 2012 Newmar Canyon Star Motorhome 3642. This will give you the support you need and even can allow you to easily tailor the amount of support you get on either side of the motorhome to level it side to side. view full answer...
The 2013 Newmar Canyon Star Motorhome that is built on the Ford F-53 chassis, will use the Roadmaster Exact Center Steering Stabilizer with Custom Brackets for Ford F-53 Chassis, # RM36RR. view full answer...
I may have a solution for you but there are no custom fit front mount trailer hitches available for the 2011-2012 ford F-53 Chassis. The Curt Adjustable Width Trailer Hitch Receiver for RVs part # C13702 or the Curt Adjustable Width 2" drop Trailer Hitch Receiver for RVs part # C13701 would be the options to check out.
I do not have specific data for the overhang you have past the frame on your 2012 Newmar Canyon Star but these would be the only options I have that would come close to... view full answer...
I recommend adding front and rear SumoSprings to your RV. For the front kit you would need # SSF-173-40-2 and for the rear use # SSR-187-54-1. These will help to keep your RV from swaying in higher winds and when cornering. view full answer...