I have the same model as you, and had a Reich mover , leisure battery and Ctek charger fitted by Midland Movers in Walsall.They did it while I waited and with the the Ctek charger you just leave the EHU plugged in all the time you are parked up and it keeps the battery charged up, never missed a beat in two years.
This is the mover recommended by AL and most often seen on Eriba's.You may have problems with clearance on any mover, check out if it will fit.