The Prodigy P3 part # 90195 would be a simple and easy solution for your truck to control the electric brakes of your trailer. This is what we normally recommend for your exact situation nearly every time. view full answer...
For your 2017 Ram 1500, I recommend the Air Lift LoadLifter 5000 Air Helper Springs - Rear Axle # AL57365 which will give you the load leveling support you desire as well as the adjustability of 5 to 100 psi for the best ride quality. This kit comes with the manual inflation valves and will allow you to adjust each spring individually. This product requires at least 8-1/8 inches between the frame and the jounce bumper strike plate.
A really nice alternative is the Air Lift AirLift 1000... view full answer...
For your Peterbilt 335 I definitely recommend going with the Tekonsha Prodigy P3 Trailer Brake Controller # 90195 over the Hayes # HA100400C because it's going to allow for a much easier install and is more economically priced. The P3 also offers a clearer LED display on the unit itself so it's more user-friendly during actual operation as well.
For power the P3 will just get wired into the truck like the Hayes controller, tapping into 12V power and the brake light switch. The difference... view full answer...
I called a few of our pintle hook manufacturers as well as went out to our warehouse to measure some for you. Unfortunately, none of them will accept a 2" thick lunette ring. The majority of them are designed for a 1-3/4" thick ring like the Buyers Products 15 Ton Pintle Hook part # 337PH15.
It looks like from the photo you attached you are right at the 1-3/4" measurement so the Buyers Products 15 Ton Pintle Hook may still work for you. If not your best option would be to replace it with... view full answer...
The Equa-Flex Cushioned Equalizers # LC281314 that you referenced was designed to be used with the very popular and most common leaf spring width of 1-3/4 inches. view full answer...