G'day All,
I did something similar back in 2003, when I towed one of my S2A 88"GS Land Rover to Corowa on a 'A' frame, I could control the rotating beacon from inside my 110, I can't post pix in here to show the set up, but it was effective on the F3 & Hume hwy, only one clown tried to get between the 2 Land Rovers

and that was in sydney somewhere on the way home, cheers Dennis