I hate to mention "more money" - BUT - - a good full motion air hitch will give you the best of both worlds. A four bag hitch like Air Safe will not only cushion the up and down movement but will cushion fore/aft and side play issues. This then reduces chucking (fore/aft) and the up/down movement that bounces the truck and trailer up and down. This dramatically reduces the strain on the kingpin framing. We put on the MorRyde kingpin and were very impressed with the improved ride, but not totally satisfied. A failure of my kingpin framing (and $3000 later - - thankfully paid for by Carriage) sealed my mindset of adding the air cushioned hitch. The improvement was very noticeable. If you are investing, consider going all the way on something that will stay with your truck when/if you trade fivers.
2003 Dodge HO 6 speed Laramie Dually, Jordan controller, RDS fuel tank, Air Ride 25K hitch
Carriage 36' fiver, Onan 6500, Prosine 2K inverter, 3 slides, MORyde IS and Kingpin