I looked at Roadmaster's info and claims when they first came out, and again this morning. From a marketing perspective, they cover most of the buzz words, but strangely left out the word "Tactical", what are they thinking? You'd have to know what an active suspension is to get the joke, check out Williams-Renault F1 from the 90's, active suspension is amazing engineering).
In short, these are bolt on helper springs, that stiffen up one side of the leaf pack. They might be the finest help spring available. No, these won't turn your 90yr old leaf spring design into 'active', aren't going to get you better fuel economy (and actual Roadmaster claim) they don't replace an anti-swaybar, stiffer spring never do (although stiffer springs do reduce body roll, at the expence of ride quality).
These are some of the easiest helper springs you could imagine adding, which is why installers must love them, almost as easy as the old Hellwig design. <https://www.hellwigproducts.com/product-list/helper-springs/>
1995 E350 7.3 Diesel, 4x4 high roof camper, UJOR 4" lift