Unlike car manufacturers, who supply parts for a minimum of 10 years, caravan manufacturers generally only supply parts while their caravans are under warranty, 3-5 years.
It's possible to get specialist printers to make up one-off decals but the cost is likely to be prohibitive.
Last year, at the CC Preshope site, I did see an owner who was gradually re-painting his '80s Piper including the lettering and stripes - the work done looked very smart.