Another tip:
I mounted my IBC on a plinth, so it is higher than my van tank when the van is parked outside.
I've mounted a keyswitch in the shed wall, so I don't even have to open the shed to fill the tank. All I need do is put the delivery hose in the van tank, give the keyswitch a quick turn and then switch it off. The tank fills by syphonic action, so no wear on the pump - it should last for years
Cheers,
Ian