Airbags- built in air compressor or manual fill?

IMO only necessary if you're airing up and down while on the road.
Yes a bike pump would do the same, but I have a compressor for my exhaust brake that I tapped into with an air hose for the bags primarily.
Was really handy on this last trip, unloaded the camper a few times during extended stays in areas. Made it super easy to air back up once the camper was back on.
Never used it though before this trip cause never took the camper off except at home.