Oh wow. That brings back memories from years ago, driving across the country in my Model S, before the Superchargers were able to connect me. Relying on public L2 charging was a pain, mostly because they tended to be 24A @ 208VAC (5kW), which is terrible. However, since Teslas already come with an easily transported 10kW EVSE, I found it more efficient to charge up at RV parks. The goal is to find a spot that is closest to the breaker box, and the breaker box that is closest to the main transformer. Those tend to give the highest voltage, which would put me closest to 10kW charging. I even found a nice motel that had a 6-50 outlet near my room, and the maintenance person allowed me to use it. $30 or so worth of parts and a trip to the hardware store got me a 14-50 to 6-50 adapter made, which charged me up to full, overnight.
Since the Bolt EV can do 7.2kW (7.7?) investing in a portable 10kW EVSE would be wise. I think VegasBrad sells some well put together OpenEVSE units in the For Sale, section of the forums. I would get a 14-50 plug, and then use adapters.
The one thing I'm curious about, that I haven't seen any one ask, is if the Bolt will charge at more than 12 amps on 120VAC. That would be nice to have if the only outlet is a TT-30, which can do 24A @ 120V which is close to 3kW, and is also common at RV parks.