I have a factory Barrett M82A1 in the factory Pelican hard case.

I'm looking for recommendations on a wagon/cart/dolly to carryall my sh*t at the range (from the parking lot to firing line). 

Suggestions?

I picked up a vintage Radio Flyer wagon at the swap meet.  I fabricated articulated steering, added inflatable dolly wheels and an extra 16 ga sheet to the bottom.  I rhino lined the interior.  

Harbor Freight sells some ready to go wagons if you need something with less effort.

Amazon sells folding dollies in the 150, 300, and 600 pound range.

I got both.

I also have a couple Anvil cases with retractable handle and wheels.  Not good on gravel, but OK for hard surface.

Get one of the green lawn carts/wagons that the sides come down.  Three gunners adapt a jogging stroller to carry equipment if the terrain is rough.