It appears to be a twin screw from looking at the side view. That long overhang could give you a problem going in and out of driveways. A lot would depend on how well the box is constructed. At that price you could gut the inside and put in what you want.
Really hard to tell from the pictures. may be worth a trip out there to take a look although Riverside is long way from Kansas....just my opinion.
MMM
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