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I downloaded the 2021 manual before I got the truck and read it three times and didn't see that restriction. I just checked my paper manual that came with the truck as well as the one I downloaded and no mention of a 30 foot restriction. It does say, that the system supports trailer with up to 12 tires. Any trailer with 12 tires is probably longer than 30 feet. Regardless, given that the problem is a range issue, the owner is left with few options to get the system to work properly. Shorter trailer or extend the receiver closer to the trailer axles.
I have no way of knowing when/if it was updated, but it's on page 248, under system limitations, of the 2021 manual available for download at Ram's website. I know I read it before ordering my 2022, which was ordered on 12/24/21.