Also worth remembering the difference between driving on the right & the left. Front suspension & steering alignment is set up so that the van naturally steers to the left (a bit) when driving on a road cambered to the right. (as in the USA)
Our roads are cambered to the left (of course) so the steering is always slightly out of line, so it should be worth a thorough alignment check, caster, camber & toe-in/out.
The natural inclination of the van is to drift to the left, so in the UK you're always trying to counteract the (slight) pull to the left.
Worth a check, any good alignment technician should be able to sort it out.
Don't ask me to explain why I'm a vanner. Those who know don't need to. Those who don't won't understand.