i brought my Gates tension gauge with me, and the service dept allowed me back in the shop to show them how to install/tension belt and how the shifter unit fits back into the dropout. There were other issues as well, but the bottom line is that they were easy to work with, and I’d recommend the shop to anyone in DC with a Bosch bike.
If I were contemplating an R&M purchase, I’d interview your LBS in advance and get their thoughts. I have a shop near me with mechanics I really trust, but they don’t sell (many) ebikes. I’ve been campaigning for Bosch certification for a while and just last week sent their contact info to the Bosch rep (who I met here) to get the ball rolling. As it turns out, the shop has the maintenance contract with a local govt entity and is seeing more Bosch ebikes coming through the shop, so I have my fingers crossed that soon I’ll have another option a mile away.
Finally, even if hours away, I’d maintain a relationship to whatever extent possible with your R&M dealer bc the bottom line is that for R&M-specific parts, it’s your only source. In my travels, I’ve learned that R&M dealers in the US differ greatly in terms of which parts they have on hand vs what must be ordered from Germany.