One of the comments to the last post of tips (I think it was Southern Grip) mentioned using a 4' level to align your wheels before a dance floor move. This is a great technique that I've somehow forgotten to mention. Every dolly skews around to some extent. It depends on weight distribution, where you are pushing from, and how far your move is. Chapman dollies have friction tabs instead of positive wheel locks like Fishers. You generally keep the lines on the tabs in line with the lines on the wheels from center steer position and they work fine. To get a little more true alignment, however, it's a good idea to use a level (or any straight edge at least 4' long. Put the dolly in center steer locked position, loosen the tabs on one side of the dolly, press your level firmly against the outside flat face of the wheels, lock the tabs when they're aligned and repeat for the other side. You'll find that this does a great job of lining them up and tracking will improve (as much as it's gonna). Always ask for some extra shims for the tabs from Chapman or the rental house too. The tabs tend to loosen up over time and the slightest bump will throw them out of alignment. Removing the top plate of the tabs and shimming them will tighten them up.
I love the "tips" posts just for the fact that they generate so much response. Some agree, and some disagree, but at least everyone talks and we can all learn a few things. If you have any tips that you use, either email them to the address above, or leave them in the comments and I'll post some of them.