Never seen or heard of the hitches you've asked about. The newest Trail Air hitch is the Flex Air that combines the Roto Flex pin with air bag/shock hitch. I know of folks have it & are happy with it.
https://www.campingworld.com/flex-ai...hoCFIoQAvD_BwE
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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