It's not always easy to hook up to the toad car's lights. In many cases, RVers simply have to add 'auxiliary' lighting system. This often translates attaching additional lights to the back of the car, then running wires up to the motorhome. We've seen some – shall we say – "creative" ways of doing this. Some RVers actually bore holes in the back of their toad cars and add a couple of light fixtures which then reside there permanently. Not great for resale value, but for them, it works. Others attach a set of magnetically mounted lights to the back of the toad, then struggle to figure out how to run wiring up to the motorhome. If the wires run over the paint job, flapping wires can quickly wear holes in the paint. Unsightly and a resale killer.
There are plenty of wireless tow light systems for sale on the Internet. Several "varieties," are available on amazon.com. Here's an advantage: Amazon customers can comment on their purchases and how they worked out. We suggest you look closely at user comments, as there are problems that some units seem to have. One is that if the magnets on the tow lights aren't strong enough, hit a bump, and your tow lights jump off the toad car and smash on the pavement. Others have complained about "intermittent connections," perhaps from too poor a signal from the transmitter back to the tow lights.
Another option? Hire an automotive electrical specialist to wire your toad car to use its own lights when connected to your motorhome. It'll cost you, sure enough, but should be reliable. Of course, the wireless option allows you to "take it with you" when you get a different toad car.