Yes: Metro Vac. I've reviewed several of their products (although not 12V) and all have been very high quality. As far as I know they are corded, but that allows significantly more power.
For cordless/rechargeable, the Dyson stick vacs have pretty good power and some handy attachments. If you have a full charge on it before you leave home, you'll have plenty of charge to vacuum camper floor several times.
I have a shark euro pro 110 vac. Its small and works well. I wasn't impressed with the 12v vacs I tried. If you have an inverter I'd go with a corded vac.
Bought a Milwaukee spot-vac because it shares the M12 Fuel batteries with other tools that I own. It is a spot-vac and is good at that function, but you're going to be disappointed it you're expecting it to be a shop-vac or even home vacuum.