If you want a compromise for price/performance, there is a 32 Amp portable EVSE out there by Zencar:
It can use 120v or 240v, and Charges at 10, 16, 24 and 32 Amps. 8-in-1
Most B-Class users use it on 240v/32 Amps setting with a 40 Amp Circuit
It has a 14-50P connector and a long 25 foot cable...