Texas Wildfire and my burned property

The wildfire went through my four acres like a hot knife in butter. It missed the old farm house and the shop. A giant pile of tree limbs were covering a few piles of old parts. So now the clean up has begun, with 90% of the ground cover gone it looks like a sand dune now. Trying to decide on hiring out the regrading work or buying an older Cat dozer. Found this on FB Markerplace and wondering what this tag can tell me.

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Nice sprockets

What's a practical size dozer for four acres?

I wold suggest renting a machine for just 4 acres--maybe a d4 size or whats convenient to rent and the cost

I'd like to stay out of the hauling world and delivery is out of the local hauling area. I want a skid steer and excavator also.