Hey there Gypsy.
My guess would be that once waxed, the water spotting will be minimalized. A good trick may be to utilize a California Squeegie (silicone based strip on a handle) or something of equal quality that will not scratch immediately after a final rinse. I've used one of these on my show cars for years and they work great. The final drying process is much easier and takes quite a bit less time, effort and cotton towels. If you have a cleaning partner, I would imagine you can get it done before the sun has time to spot the few areas that might bead water on a vertical, well waxed surface. I can recommend Canon towels for drying as they are 100% cotton with cotton threads for the edge bindings. Other towels utilize nylon threads and will scratch your aluminum, paint or clearcoatings. If in doubt about the binding threads, just put a gas cigarette lighter to the threads and if they melt.....well, you get the picture. WalMart is the cheapest place to purchase the Canon products. If you use towels, be certain to use white and not colored towels as the dyed products are a bit rougher and will scratch as well.
Good luck. There's nothing prettier than a well polished Vintage Airstream Trailer rolling across the countryside in my opinion.
In dog years, I'm dead!