If you’re not completely comfortable backing up in new places, I’d recommend you get some sort of backup camera. This one is listed as wireless, but no system on the market that is affordable is completely wireless. The cameras require a power source which is typically the reverse lights, so power is only used when backing up. If your mobile boutique is an enclosed trailer, you might find these have trouble transmitting the wireless signal through the trailer. If that is the case, you might need to modify the antenna so that it reaches the monitor properly.