Parts : this list was put together for our Rhinomax 2017 Scorpion, but other Rhinomax vans no doubt use some of the same items and the cover and annex manufacturers are generic.
Industrial Rubber Supplies
Large chrome compression lock (SKU: NS718-4C-1DCH63)
Contact IRS to get the key the same as yours. For example, for key number 71, the part number is NS718-4C-1DCH71
Small chrome compression lock (SKU: NS718-3C-1DCH65)
Contact IRS to get the key the same as yours. For example, for key number 71, the part number is NS718-3C-1DCH7.
Push-pull drawer latch (SKU: BHMP05)
Popup shower gas struts (18mm diameter, length 525mm, pressure 100N)
Bolt for ball cup (if needed separately, not supplied with strut)
Covers/Annex
Custom Covers (they have done some Rhinomax vans previously) and have a very nice storm cover
Ozi Canvas annex makers (they have done some Rhinomax vans previously)