Funny one Bob. This thing gets major cleaning before every trip. Got a 3 and 5 year old that cannot aim good. Wife being retired nurse is clean nut.
The Vegas we have is considerably nose down. The yellow camco drive on ramps do great for leveling. We do not have conventional post levelers as many of my pals have. At the track they end up using plywood under levelers in rainy season. I just use the drive on ramps. They do not seem to sink in easy.
The service tech when we picked up told us keep a little water in the bowl so seal will not dry out. Not much but enough to immerse rubber. He also told me is quick indicator of level by looking in clean bowl.
The yellow ramps I have are rated for 3,000 lbs each.