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I have had bad experiences with the arena board when i used it for a marine application, in the summer heat the board expanded about a inch in length & width on a 4x8 sheet. Buckling and bulging because of it was screwed down.
If you were to have slide holes for the expansion it would adjust itself. Also it is 1/4" thick and weighs 80-90 pounds a sheet.
a 1/4" sheet of plywood is lighter & cheaper,and if it is painted black it shouldn't look too ghetto..
With the wet back roads and winter snow you get in Saskatchewan having a 4x4 is a nice feature, i would search for a more economy minded 4x4, a older Suzuki comes to mind.