not different companies, they are exact twins of each other. both are made in the same factory. one day they put Roo deacals on them and the next day they put Shamrock decals on them.:W
they are exactly the same trailers, with the same materials.
the only differences are outside graphics and interior fabric decor/patterns.
one big difference is that there are way more Roo dealers than Shamrock dealers. and the two biggest "wholesalers", RVW and RVDirect both sell the Roo, so prices are usually lower on the Roo nationwide, due to their low prices.
and the Anderson WDH is not the "Equalizer", that's a brand name of a WDH. the 4-point American-made Equal-i-zer is a well loved and highly recommended WDH that has built-in sway control.