" This has very limited stopping power at high was speed and could put the vehicle into a spin."
What do you think will happen if the service brakes are locked up with no one on board to control the steering?
I certainly wish some independent testing agency would hook up a toad with explosive bolts, with these braking systems installed, and cut it loose at 70 MPH to see what would happen. I do believe the results would be informative and educational! Sometimes it appears that many folks believe the rig will come to a nice, straight-line stop. I don't think so. It may very well be a disaster.
Again, some testing to verify the results would be a very good thing, IMO.
I haven't had a vehicle with a separate parking brake for years, IIRC. I think the last one was a 1951 Plymouth convertible. I believe all the rest have actuated the rear service brakes. I could be wrong, it happens frequently. The older I get, the more frequently it happens.
