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Your going to have to sink a fair amount of money into modification of an existing caravan or buying something purpose built, and for how much utility and viewing time. You can't really observe in caravan parks because there is usually too much light, so free camping might be your only option.
Rather than mod a caravan why not just get a scope that can fit into the caravan storage box and build a transport cradle for it. I am thinking that any 12" scope (Dob, Newt, etc) would fit into a caravan storage area - particularly the ones that run across the van under the bed for example. It's worth considering what you could do with existing designs.
For a mount inside a trailer or caravan you are going to have stabilisation and alignment issues. I have to put down stabilisers for my camper trailer to keep it from rocking around and I know how much time that can take. If your after a completely level setup for viewing from inside then add more time and cost.
Setting it up outside is probably going to give you a more stable base and make alignment easier (especially if your using a compass with all the metal in caravans and trailers).
I have a cheap toilet popup tent that works well for my observatory, well at least to keep the scope protected until night time, and few people will wander into a toilet cubicle to steal something. It lifts off the scope easily when time comes to use it. If you carry the scope inside the van storage cradle the amount of setup time should not be much, and the toilet popup can be used at home as well. If your scope is sitting inside your popup inside a secure backyard which is out of sight from the street then it could be left up overnight. Most of the toilet popups are ventilated at the top, so they don't hold condensation like other tents can, but run your fan if your concerned about it.
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