It is a fairly large base for the size of the vehicle, so your challenge will be to make it less bare and more interesting. A fence requires something on the other side. A large base also calls out for figures to add life.
You could have part of a ruined building, which you can make up from plaster yourself, or a barn from wood strip, low cost.
Ideas:
the remnant of an abandoned observation/artillery pit? Add some soil on top of what you have to create a berm that they hid behind:
and add a discarded tarp (maybe a shredded one from returned artillery fire?)
You could even have the remnant of an aircraft that crashed. It does not have to be recognisable, just a jumble of wing parts made from flat styrene stock and wire.
Google for inspiration.