Again for homologation reasons, referring above all to 35 quintal approved vehicles, camper manufacturers often equip the vehicles with the infamous puncture "repair kit". I don't know if anyone has ever actually used it, but listen to me: it doesn't give you any chance to continue after a good puncture.
First of all, make sure that when you take out the insurance, the roadside assistance (absolutely essential) provided also includes the call for puncture , this is usually the case, but it is better to check. Sometimes the call for drilling is not included if made in the municipality of residence, watch out!
Then it would be better to have a real spare wheel , with a jack suitable for reach and extension (of the hydraulic bottle type) and cross wrenches of the right length.
The problem is where to put the spare wheel , it is often placed under the floor with a sort of basket to keep it anchored, a solution which creates many difficulties in extracting it when needed. If possible, it is better to put it in the garage , well secured and within easy reach. I've always had a spare wheel in all my campers (I don't even want to see the kit) but I've always carried it ... in the basket under the floor.
I will be obvious, but in case of a puncture: do not go under the camper if it has been jacked up and make sure you loosen the bolts of the punctured wheel before jacking it up . Some good advice here .