Most manufacturers will modify any model with nearly any reasonable alternative. They can do so much more easily than on a stick-built home.
I installed them for a few years, and have been on “the shop floor” when they were building them (didn’t work in the factory, just picking up parts).
Take one that is 2 story, wrapped in OSB AND Hardie plank, plus architectural shingles ,and you can not get enough axles under a fulls sized one to keep from blowing tires.