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Tully, there is a lot of good information available on different trailer wiring issues on the net. Here is a good source of help. You can get a 6 way to 7 way adaptor in male or female but I'm not sure what you will loose without looking at the wiring diagram.
http://www.etrailer.com/faq_wiring.aspx
If your bus is going to be the primary tow vehicle for the trailer, I would insist that the trailer manufacturer supply the trailer with the proper hookup.
Normally there will be at least a couple of terminals that are not used.
green and yellow/left and right
red/brake
brown and black/marker lights
anti lock will have a terminal/color ?
That's 6 and if you need you can combine the brown and black on 1 wire freeing up one unless you have 6 gazilion marker lights on the trlr.
Often on the trlr the brake and turns are on the same bulb/element but if not this is where you need to make things compatible.
Poking your loom with the point of a circuit tester compromising your insulation is voodoo and will ruin your wiring in the years to come DO NOT DO THAT.
The factory does a very good job on the wiring. Usually when a problem arises you can go directly to where people have modified things and find the problem. That is the first place I look.