Very nice that you want to spice up your caravan with some paintings. My uncle also loves paintings and murals and always asks me to get him some when I travel through Europe, and most of the times I don’t have the money to buy something so expensive, so I just rely on
print-services.com, a website with a lot of paintings, cheap prices, and the possibility to resize your painting so that It fits the wall you want to hang it on. Check it out, maybe you’ll find some paintings that you like.