In 1994, we purchased a new mobile home. We had a similar issue to yours, hope this info helps.
Turns out that the GFCI in our master bath was bad (would not RESET & sparked when we tried). The mobile home dealer told us to replace the GFCI with one from HomeDepot & they reimbursed us.
NOTE: That single GFCI was on a GFCI breaker that controlled the following items:
GFCI outlet in master bath (has TEST/RESET switches) & guest bath (which did not have TEST/RESET in guest bath so we had no clue), the wall outlets on one of our inside walls (which is the tallest wall inside that was exposed to elements during transport to/from manufacturer & dealer before the 2 double-wide halves are joined), and 2 outdoor outlets. What becomes bothersome is that if the GFCI in the bathroom trips, the outlets all go off on that same breaker (i.e., outdoor outlet power, one outlet in living room, both bathroom outlets). If I cannot get the outside outlets to work, I have to run indoors & check to see if the bathroom outlet needs RESET. I would have thought each outlet had its own GFCI trips, but they are all thrown @once, if any outlet in the circuit experiences an issue.