I use a 48' piece of 8020 2012 extrusion with connectors I designed to keep my rails aligned and have no problems with combining rails, I have the 75", 55"s, and 32" rails and pretty much make any length I need.
I use a 48' piece of 8020 2012 extrusion with connectors I designed to keep my rails aligned and have no problems with combining rails, I have the 75", 55"s, and 32" rails and pretty much make any length I need.