Linear Rail for wall mounting

I couldn't find any good solutions to making a big linear rail, which I wanted to mount a whiteboard to for my office. I wanted around 60" of travel, so the whiteboard could go across the whole room.
I rate each of the wheels (in properly printed ABS) at ~200lbs without a problem, and the rails below will only deflect .06" with 60" of travel at that same loading.

If you are looking to carry more than 200lbs per rail span/wheel, or 200lbs/200+ for a distance longer a bit longer than 60", leave a comment, would love to see how much interest there would be in a heavy duty linear rail system.

Parts list from McMaster: around 188$, (144$ for 4x rails)

[Link](https://www.mcmaster.com/9056K36/) 1" aluminum Pipe
[Link](https://www.mcmaster.com/90710A120/) 18-8 Jam nut
[Link](https://www.mcmaster.com/1655T6/) Mirror Aluminum Plate
[Link](https://www.mcmaster.com/91455A130) Washer
[Link](https://www.mcmaster.com/92095A296/) M8, 45mm long hex screw
Just add your favorite 608 bea