What range are these tow truck freqs in?
I believe what Noah will be looking for is a DMR T3 System in that region, so even if he were to program in the voice frequencies, he wouldn't be able to easily listen to tow trucks.
Noah, you need at minimum a UBCD436PT to achieve what you want
EDIT: After a quick look through the ACMA frequency register, I couldn't find anything specifically related to tow trucks, and there doesn't appear to be a trunked network with range out that far. It's likely licenced under someone else or they are using mobile phones and tablets (common in the tow truck industry here).