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Software has gotten so good at dealing with stitching errors, parallax etc, I haven't felt the need to bother with a slide in probably 5 years.
I used to use slides, a gigapan, nodal ninja etc, and back in the day you needed that stuff, but these days you can sloppily handhold a multi-row pano and it still comes out pretty flawless with the press of a button.
Have you tried doing pano's with your existing gear and found problems ? I'd just try doing some straight first and think you'll be surprised at what you can get away with, even with regards to foreground objects etc.
If you really want a slide though, just line up two objects in a row, like two batteries, and pan back and forth, noting the distance of the nodal point til you don't see paralax. No clue where the points will be, maybe close, might be a foot, etc, but its easy to test it yourself and find out what the true distances are, then buy a rail long enough
Again though, not like your going to be doing any extreme near/far compositions with a 55-200, so I think in 99.9% of cases you won't need a rail for a telephoto
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