I have a question for you, Will you be taking the coach to the site you are skywatching at or will you transfer it to the tow vehicle. If so then you might want to look at some of the off road capable class C units. There are a couple that photographers use. I am going to get one for my next coach for that very reason. Waiting on the sun in the comfort of the coach with the rig set up outside getting used to the air and humidity if there is any or the cold if it is as it usually is. If not then any pass thru coach will work. I have a Foretravel and can put two mobility scooters underneath, the full sized ones. I have seen coaches that you can put a motorcycle underneath without the windscreen but it will stand up. So there are coaches that will work.
