On bike camping trips and when working on motocross bike engines and getting burnt we always had "Burnesze" to hand and "Waspeze" on summer camping trips.
These two items are extras in both our car and caravan first aid kits.
Tip 1, forget granny's and aunty Flo's old wive tails, put good first aid kit in you car and caravan. With good burn and sting treatment + add after sun care if you like the beach or site pools. If you can find Solarcaine burn treatment in continental chemists it the best remedy for sun burn if you are silly enought to get caught out.
Tip 2, get good maps and "Mappy" or "Via Michelin" route and use along with good Satnav. Technology is not perfect, but its pretty darn good when towing.
Tip 3, Keep steady handle in car, forget pop bottles,liquids or builders spirit levels. A two way level for a pound or so from caravan accessory shops screwed into place inside windows will always be there and you can level the van without even opening it.
Tip 4, Keep waterproofs and boots handy in the car, for when you arrive in a down pour. If you have the weight capacity, water for a few cuppas is handy for a break before you track down water supply on late arrival on a wet windy cold night.
Tip 5, There are lots of sites to visit, don't go back, explore others.
Tip 6,Air bag jack for jacking car/caravan, probably our best ever buy.
Tip 7, Technology, a variety of solar panels will keep battery topped up or give power boost when there is no hook up.
More sites have internet and lots of free connections, take a compact laptop. Thers are many uses for it to turn to. Mobile phone, even if only for emergency use.
Tip 8, Plug in bug killer at night time and use blown air heating fan to keep cool on hot continental nights.
Tip 9, Pet Gofor.
Useful for getting water and emptying rubbish
or nipping to camp shop for milk and morning paper, we miss ours they called us Mum and Dad