As you live in VT, a cooler place a worry I might have is keeping something as large as a bus warm. I could see keeping the inside warm and windows frost-free could take as much power as moving the bus around. As unpopular as it might be with some, to me it might be best for the bus to have a diesel heater, and just use the batteries to move the bus around. On something as large as a bus I suppose you could use other means to heat the bus, propane? which would be cleaner than diesel but heating with batteries alone seems like a large burden on the batteries.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a