Lol, just close your eyes as you hand over the cheque..........................................check your wheel nuts before you drive off with it, the apprentice may not have done them all up, it's common, always after it's been in for a service....it always pays to have a quick check every couple of days when on the road also, no need to swing off them like a gorilla just a gentle one handed lean on the bar to make sure, its a good habit to get into on tug and van as you can keep an eye on tyre condition, no wet stuff on rims, (brake or bearings) checking every few days by just walking and looking can also pick up on nuts missing or bits of tyre gone astray.
Soon as you get home plug in the 240, power up fridge, check all lights,
plug in water THEN run hot tap till it flows then turn on HWS, open all doors run water to make sure drains okay, open and close everything just to make sure it's all there and it all works and you know how to work it...................Just because the salesman said it was okay does not mean that it is....tyre pressure can be worked out here:
https://caravanchronicles.com/guides/calculate-the-correct-tyre-pressure-for-your-caravan/
Have a look at your compliance plate to make sure you have one then never look at it again, it will usually be incorrect.
Sit back in yard, beer in hand and keep smiling.....................oh and leave fridge on for at least 24 hrs so it will get cold.........don't leave HWS on for ages as it is like a kettle and will cost a fortne, 30 mins should have heaps hot water................