Motorhome Chassis/Engine Maintenance & Towbar Install?

I use independent shops to do maintenance. I keep a log for oil changes, transmission service and any repairs.
Oil changes have been done at quicky style locales and have even used Walmarts.
I do not trust dealers whether rv or automotive.
I would suggest posting where you are located in Texas as some posters may have specific locations to do tow bar and light installs.