Does Yeovilton and Culdrose have their own caravan sites for RN personnel?
If so it could be a wise move to buy a good used residential caravan and put it on the RN site.
This is what I started with over 50 years ago.
RN site rents were very cheap, and facilities good, including the club house.
Commercial sites insist that caravans are removed when they reach about 20 years of age.
There is still a good 30 years life still left in them, but hey can be bought for as little as £5K.
If both Culdrose and Yeovilton have sites the RN used to bay for your van to be moved when drafted