Firstly :hugs: to you and your family. The hurdles we have to jump as parents of children with disabilities can be rediculus!!!!

I dont know how big your family is but with the caravan what about booking a cabin and unpowered tent site but have everyone sleep in the cabin?? Cheaper than two cabins as someone suggested, the caravan operators dont need to know that none of you are actually in a tent. Depending on the age of your other kids they may enjoy spending a couple of nights in a tent anyway????

Good luck with everything

Sjl