The test is a little open to interpretation though.Ta; that is, I assume, the test I mentioned in post #6 (so: R8, not R10 -memory!) - he wouldn't have his hands out of the window if the rears locked! (Not that they would, even with limiter valve removed.)
They state "to achieve 4-wheel lockup proved to be difficult", but they didn't say impossible?
They say "there are only two black lines because the front and rear wheels track in the same path", which alludes to; if they hadn't have, there would be four black lines?
Then they refer to 65 mph stops with "the wheels locked". I could be wrong, but I reckon if it was only the front wheels locked, that's probably what they would have written?