* FINAL UPDATE *
As mentioned, the Sumosprings customer service was fabulous! Not only did they send me new Sumosprings, but also sent landing platforms to ensure that I wouldn’t have the same issue as I initially experienced. Even more, because I’d mentioned that I noticed more ‘drift’ in the F350 steering as compared to my prior Duramax3500, they sent me some additional bump stops to engage the overload springs earlier to help with handling; FREE!
After installing everything (an hour and a half because I did it in campground) everything is working great. I’ve traveled ~2K miles in the Rockies and high plains (including a couple days in strong, gusty, cross winds) and the loaded handling is wonderful. Solved the squat issue, as well as significantly reduced the steering drift I’d noticed. Additionally, I’ve put on another 2K miles unloaded and am equally happy with unloaded performance. The unloaded gap means that unloaded performance is identical to pre-Sumosprings unless I hit larger bumps which then start to engage. I do notice large bumps can cause the overload stops to make a noise once in a while. Bottom line though, I’m happy to trade that for the superior loaded performance.
End result - very happy with Sumosprings, even happier with their customer service!!