For the past couple of years I have travelled a LOT to the US and Back again. Here are some suggestions / points to make (Besides the ID).
Depending on the Value of the system, you may want to declare it with Canada Customs so that you don't get nailed and they say you bought that 3,000 worth of Equipment in the US.
If a bunch of you are going down, try and schedule a crossing time, or a meet location. Call the specific border you are crossing, and inform them that you are going to the US for this Event. Back when I was in Scouts, when you had 50 or 60 cars packed full with Kids, and were wanting to cross to the US, we made sure that they knew of the large jamboree that we were attending; all vehicles were waved through.
Mind you this was a few years ago, I do not know if this will be the same, especially at a much larger crossing border.
Make sure your equipment is hooked up and WORKING, especially if you are storing all your things in your back seat instead of the trunk. The US Customs loves to pull me over to the side, but after a brief demonstration that my equipment is working, I am set free.
Any other information, or to double check, contact Canada Customs.. heres the link to Contact Page
Canada Customs Contact Page [ September 17, 2003, 05:53 PM: Message edited by: Fuzz ]