That shouldn't be difficult at all. You can buy heavy wire at a good hardware store or automotive/4x4 shop, the sort of thing you'd use to wire up things like starter motors, winches and audio amplifiers. They will also have crimp connectors suitable for large heavy wires. Given the remote sensing capability you might not even need anything crazy, 6AWG copper wire is good for 101A in chassis wiring, which is effectively what this will be given the short distance.