LexusPia

Maybe some of you who have a trailer hitch on your RX can help me out. I have a 2008 RX350AWD with a factory trailer hitch/receiver installed by the local Lexus dealer when I purchased the vehicle new. It comes with a factory wiring harness too. Is there a way I can test it to see whether this wiring harness works or not without actually renting a U-Haul trailer? I want to make sure it works before I rent a trailer. Also, will there be something in the dash that tells me everything is hooked up properly? Thanks.