You'r Thinking About The Wrong End For Crap
All crap is not related to the back end, of the bus, that is.
The other way to go, is via the front.
Read the link and view the video. If you go this route you will be able to see the bikes and keep an eye on them with every driving moment and possibly be able to shield them with "a Clear Plastic Shield"
http://bicycling.511.org/transit.htm
;):D
5 Attachment(s)
UPDATE - Hanging crap on the back - The Winner Is --
Here it is:D
It was easy to assemble, well made, well finished and to less than 5 minutes to install and adjust.
Picture 1 is the new hitch/rack loaded with a bike on the back of the truck
Attachment 4983
Picture 2 s the rack swung to a 90 degree position
Attachment 4984
Picture 3 is the truck opened up
Attachment 4985
Picture 4 is the latch handle and you can see the coated steel bar behind my hand which is a heavy threaded locking bolt to hold it together so that the latch can't become disengaged while traveling
Attachment 4986
Picture 5 is the swing arm locking pin. This can be engaged in either of the two holes to prevent motion from the closed or 90 degree open position.
Attachment 4987
This works just like I wanted it to. That's no crap.:D