Yes..
A smart mains charger.....
Connected to the 240v EHU then to the Van's battery.....
Have a look at some of these....
Chargers and Boosters:
Victron Energy Blue Smart IP22 Charger 12/30(1) 230V -
https://amzn.to/34QoQYD
Victron Blue Power IP65 Battery Charger with built-in Bluetooth Blue Smart IP65 Charger 12/15A) -
https://amzn.to/36VeyrE
.