Most large mobile homes these days use a 200a mb loadcenter.
My usual approach to these is to mount a 200a combination meterbase/disco and pipe in to the panel with sched40 pvc conduit,supporting the conduit from the metal frame of the mobile home.
I've never failed an inspection on them,but my question,is under the mobile home,(after the underpinning is added) considered inside the building? Sometimes the distances can be up to 12 ft or so. Opinions?