There are numerous mobile repair people in the Yuma area. Several off hand that do work in this park and really don't seem to have any "dings". I have never had any since I do my own work so take it for what it is worth! This is our 12th season in Yuma.
North Idaho RV Repair (Bob Bennett)
Hilco RV
Foothils RV
Al's RV (may be the price leader as in high)
Ron's RV Repair
Sunbum RV Repair.
and there are many ore in the area.
As far as coach service, a******shoot, I'm assuming Motor Home.
LaMesa RV -Transient, will be out of the area the end of March and shop closes sooner.
RV World Permanent here in Yuma
County RV.
Country Club RV- former Honda dealer here and new boy on the block as far as RVs go.
There are numerous oil change and chassis joints.
If I can be of more help just PM me.