My 2016 Redwood had the Morryde IS on it, when it was totaled we purchased another Redwood but could NOT get Morryde to do the install that quick, so we took delivery .
We had made arrangements to have the trailer back in Indiana about a month after I took delivery to get the IS and disc brakes installed...
The new ( 2020 ) Redwood came with the Morryde SRE4000 ... We had 2 trips with the original ( SRE4000) and disc brakes... My wife and I had serious conversations about NOT spending the extra money for the IS as the SRE 4000 was that nice of a ride... NOT IS nice, but soooo much better than regular suspension ...
Anyway, we took it to Morryde, had the IS installed and the SRE4000 boxed and in the truck as I had sold it online before the swap happened..:B