Some very good advice above, little tip if you have never done anything before get the in laws to go through the whole set up on site routine, hooking up electrics, filling water barrel and connecting to van, fitting the waste water tank, levelling up with the steadies basically everything and record it all on your phone.
Have a tow before you go.
Def check weights and licence.
If all the above hasnt put you off, have some fun and enjoy, we are all due some downtime.