Oh my goodness, I have 4 guinea pigs, we used to visit our caravan every weekend with them! We had a large cage kept at the caravan and just used a smaller transport cage for them to travel in, we kept hay and dry food there and just took fresh stuff with us, they were no problem atall! We used to use the frozen water bottle trick in the travel cage, they were fine they just slept, and we are talking a 2.5 hour journey each way.
Karonus on here has a touring caravan and 4 piggies and there is no stopping them either!
There really is no excuse not to have piggies just becaus eyou have a caravan. The only one thing i will say is, while you are stayin at the caravan, do not leave them in an awning, especially if you are not there to monitor them, and take extra precautions in weather like this, even though we had a large caravan, on days like this, it would get so hot and stuffy inside, we had all windows open and a fan on.
Sadly I no longer go to the caravan, but it has nothing to do with the piggies atall.
x