i don't remember the name of the company but i sat through a presentation of a rv modification company that was located in yuma, az. they did all kinds of things such as putting in wheelchair lifts. an internet search of rv repair shops in yuma ought to ghet ytou the name and contact info. they were impressive, at least to me.
or just call a local rv body shop and see if they have any recommendations.
2015 cardinal model 3825fl
2015 dodge ram 3500 dually