hello I'm brett,,,i live in a static caravan I think you call them trailers in us,,,,,,,i keep 8 mellers in mine,,,,,,,i have lived in my caravan for many years,,,,,,my point is everyone is missing the point,,,,,,,you will have the same problems that I have,,,,,,,mobile homes,,,,get very very hot in the sun,,,,in a matter of 30 minutes when the sun hits your mobile home it will turn in to a oven,,,,,,,,,,,also the get very cold very quickly,,,,,,,,,,your 3rd problem is available space,,,,,,,so use your head,,,or you will loose your chameleon,,,,,,,,keeping your chameleon from getting to cold is easy,,,,, thermostat and heat source,,,,,,,,, the most difficult problem to solve is over heating ,,,which will happen in your camper van,,,,,,,it will kill your chameleon,,,,their is a solution , this will depend on the size of your camper van,, and the location you keep it at on the campsite,,,,,can you park your camper so that it is allway well shaded from the sun??? behind buildings or under trees?? also you can keep your chameleons in the part of your camper van which points north,,,,,the sun will not heater up the north part so much,,,,,south facing will get the sun on it the whole day,,will be much to hot for any chameleon ,,,,,,,,consider this,,,,,,,,,what type of viv to use,,,,their are many ,,to choose from,,,,,i would hang a cage from your ceiling,,hot air rises,,and will be much hotter close to the ceiling,,,,,,dont use glass,,,,glass radiates heat, and is heavy,,,,,my solution was to make my own,,to fit into available space,i used clear plastic/Perspex and mesh top,,,,works very well,,,plastic is light in weight,, and does not radiate heat,,plus is water proof,,so humidity can be maintained,,, the screen mesh top allows good ventilation and heat to escape,,,,,hope you find this use full