[FrankJ]

We have used the 80/20 (the other maker of the t channel extrusion) 10 series (1x1) which is slightly smaller than the Bosch 30X30 with no strength issues on the chassis framing. Your (and others) mileage may vary. It is a little heavy for its stiffness, but the adjustability gives a lot of advantages.

80/20 gives a substantial discount to First Teams & they also have metric profiles. Bosch supports at least First team. Bosch might well offer a discount so be sure to ask your distributor .