I love my 2 post but figure adding a 4 post would really be great for mine and dads truck. Probably just me, but I hate lifting those trucks with this lift due to where I have to lift it from.
I say go for it. I have two (4) post lifts and could not live without them Both are extra tall so I can stand and work underneath. On one of my lifts, I built a rolling gantry so I can pull motors or separate the body from the frame. (see pics of my 1972 GS).
Shawn, I would be more than happy to share my drawings and measurements with you for the design of the gantry. PM me if you want them.