Need help and advice on Towing with Hummer H2 SUT

[GamblerHummer]

I just this weekend bought my first Hummer SUT. What a vehicle ! fish competitively and tow a 21 ft Gambler bass boat. I need to get a backup camera and wanted to know what everyone recommends. I need something that can be easily uninstalled , and can be installed in my next hummer. Yes, I am hooked. Do they make any wireless cameras?

My second question is how long of a drawbar would you recommend for towing. The spare tire sticks out quite a ways, and I am concerned about damage to the vehicle and boat/trailer in any tight maneuvers and potential jackknife situations. I often get in some tight situations with ramps, and even backing in my garage around cars parked in front of my house. The neighbors using the playground in our neighborhood create quite the obstacles for me sometimes. I was thinking 12 inches long with a 4, or 6 inch drop. However, I found a 16 inch one as well. It is class III and rated for 6,000 lbs, 800lb tongue weight. I would appreciate any advice, or opinions too. I haven't measured yet, but I think that 12 inches may be to short.