I can see why you would want to install the Go Power Automatic Transfer Switch # 34264403 as it would protect your system from power back feed, but the Progressive Dynamics RV Power Control Center # PD4135K does come with some safety features to protect itself in some cases. For instance, If a battery is accidentally hooked up backwards, the converter will be protected. An easily accessible ATC type fuse will blow when a battery is connected in reverse. Replace with same type and rating.... view full answer...
The 40k pintle hook part # 33710042 is a fit for the Buyers Products Fabricators Hitch Plate # 3371809043 that you referenced. This is highest capacity option we have with the correct bolt pattern. view full answer...
The Buyers Products 50 Ton Air Compensated Pintle Hook part # 337PH50 measures 2.38" deep by 3" wide. The inner eye diameter is 1.60" wide and 1.37" tall. I contacted Buyers and this hook uses a standard Lunette ring. view full answer...