Even if you are backing up PERFECTLY straight, it don't work. I've tried using a 2 way radio with my wife stearing the TOAD, and it still don't work. I did it once in an "emergency" - as was on a hill and un-hook would have been very hard. Now, I have to replace one leg of my tow bar.
On a slightly different topic, I HIGHLY recommend that you pay a couple dollars more, and buy a tow bar that can be released under pressure. If you are in the process of turning on a slight hill, tow bars are extreemly hard to un-hook. I have a hammer and a 8" long 5/8" bolt I use to "assist" removing the pin on either side of the bar, but in certain circumstances, it can be a bear!!! Go the extra couple bucks.
Bill N8HDW & Nancy N8HDV
2005 Sea Breeze 8341 on W-22 Chassis
2008 Saturn Vue I-4