I don't have any input on that mattress. Just want to ask; when you tested the mattress in store , was it on a box spring, or on a deck?
Placing a mattress that you tested on a box spring , on the deck in your M/H will give it an intirely different feel.
JMHO; Any mattress you consider , test it on a deck , or even have it moved to the showroom floor for a try out, only way to duplicate the feel of the M/H install.
BTW. the listing on the mattress didn't come through on your post.