Also, they are too small to make a decent food wagon.
This is a cop-out. Especially when it's the government (notoriously hard to sue) selling. "You couldn't normally sell this stuff to consumers" gets sold on govdeals and ironplanet all the time.
Additionally, the LLVs likely meet applicable NHTSA regulations and FMVSSs for the year they were made and their class of vehicle.
Edit: Also, the other direction, you'll see a lot of LHD cars in the UK where American troops are deployed. That's a pretty specific loophole, but I remember getting a lot of confused looks driving around.
As to the confused looks, I would hazard a guess (having lived near a US base in the past, now not but still see EU cars every day) that they were over your choice of make/model (e.g. a Chevy of a type that no Brits buy), rather than driver side. Maybe I'm wrong and lots of people give weird looks because of the driver side, but personally I've definitely stood staring at cars that looked weird to me and were clearly US imports, but if I see a car that's common in the UK it's not that interesting noticing when there's a foreign version on the road here.
edit: oh and number plates too. American style is obviously much less common than even most old European country styles, yet alone the more standardised versions of the past couple of decades. So even if the model of car is the same, seeing an EU plate you think "they probably drove it from mainland Europe" which is pretty common for holidays, work, or just people relocating and keeping their car, whereas seeing a US plate makes you wonder who cared enough to ship it all the way here.