This is what I'm trying currently to solve this problem. Seems to be working pretty well, and it solves 2 problems, making a wide/square cross cut AND if you add the rails that go on it, making a repeated wide cross cut. It's slow compared to the table saw, no question about that, but the results seem to be between very good and perfect (or as perfect as I can measure/see). I built a 4x8 table with foam insulation on top and have set that up as my tracksawing station. Heck of an improvement vs cutting on the floor!
The big "miss" that I have right now is making a repeated dado across those wide pieces; I do have a way to do it, but I really don't like running something 24in wide and 48in long through the table saw or router table with the short end on the fence. I bought a router jig that should help with this from Woodhaven; similar to the TSO system but for a router, allowing a guided, square and repeatable setup to cut a dado. System looks really nice, just haven't had a need to use it yet.