e-tek - So far, I did have ONE time when I wanted to get my entire vehicle off of the ramps and having only one RJ45 and no additional jacking tray was a problem. So, to get around this I raised the front end with my RJ45 and then placed my 6-ton jack stands on the floor (positioned at the rear of the car) and then lowered the car on to the jack stands. I actually had the ramps themselves all the way down, the front end supported on the RJ45 and the rear supported by the stands. My 914's only weight about 2,100 pounds so the 6-ton jack stands are overkill but they're nice and tall and never even have to be extended.
Anyway, I had wanted to take all four wheels off so that I could throw them in my van and take them to get balanced (in case you are wondering - YES, I am a bit weird with my old cars and don't want anyone thrashing my rims with an impact gun or incorrectly jacking up my car using the wrong lifting points). With my daily drivers I could care less how they handle them but since they're not making anymore 1975 Porsche 914's, I have to watch out for their well being. Since you have old cars too, I know you understand exactly where I'm coming from.
BTW, I kind of did something similiar when I did an engine drop over the summer. In that case I dropped the engine and ****** together as a unit onto a 1,000 lb furniture dolly. It was easy as pie. I lowered the car close to the dolly, undid all my hoses, connections, and unbolted everything and let the powertrain fall gently onto the dolly, then I raised the car and rolled everything out. Since the ramps on the H9-B are adjustable, I was also able to set them up as wide as they go and that gave me some extra room for the engine drop.
Regarding scratches - I also got some on one of my ramps and have yet to paint them. It's a lift and it's going to get used and have chemicals sprayed/dripped on it and you're going to be putting tools on the ramps too. Just enjoy it and don't worry about it staying pretty and do wipe it down or blast it with air every now and then. Otherwise, you'll have to start a thread titled "What wax do you use on your lift?".