A mobile visit makes sense when the RV can't easily move, the site allows work, and the job fits tools that travel. Access, ground surface, power, weather, and parking all affect whether on-site work is practical.
A shop makes sense when the work needs a lift, controlled space, major parts, or more time than one visit allows. Membrane replacement and heavier structural work usually land here.
Some jobs start mobile and finish in a shop. A part that must be ordered, or damage larger than the symptom suggested, can change the plan partway through.
