You might have to stay in the vehicle for a few days
So more space is needed.
You might not need a twin axle
Under 3.5 ton should be OK but think about it
You may have to pay more NOW
But you will enjoy more AND get a better re-sale value
WE are only 2 but I would not want anything smaller
6.5 m "Full width" Good heating etc etc Maybe £18,000
Shop around go to a dealer ..if not to buy but to see what is available for you and suits !