They are great little vans , cheap as chips to own and run so far .
Will take 350 tops , 2 poles , spares ,tools , gas boiler , 19kg bottle and all the usual .
I went down to a 250 with full backpack and 25L barrel in the end as it suited better , always got home with water left in the 350 .
If you are going to run with min gear then 350 is the best choice if lots of work is anticipated , it will be ample if you think about how you set it up .