Yet another backup sensor question

[kacyk]

The other night we had a scare when my wife backed over my 4 year olds bike as she was exiting our garage. The garage is 8 feet wide so the width of the Hummer does a good job of hiding any obstacle. Thank God our little one wasn't on the bike!

We've contemplated a rear view camera but with the tire carrier installed, the the field of vision with a roof mounted cam is somewhat compromised. Additionally, when I mount a larger diameter mud tire the rear cam will be rendered useless for obstacles that are very close to the rear of the truck. Hitch cams are a viable alternative but I don't care to mess with it every time I unhook the bike carrier or (the boat to come!).

Therefore we've decided on a rear sensor instead. Our local Car Toys will sell a system for $350 installed.

Here's the question:

The device they carry has four flush mounted sensors. Nevertheless, the large metal arm used to mount the rear tire carrier prohibits the installation of all four sensors.

I have two options:

1. Go with a two sensor system. Car Toys does not recommend having only two sensors due to the size of the truck.

2. Go with a four sensor system that does not mount flush but has exposed wires (stick on) that will wrap under the bumper.

I would rather go with the two sensor system but I can't find anywhere in this forum where anyone has installed and is happy with such a system.

I thank you in advance for any feedback on this issue.