Dan its good for an indicated 108mph in my experience....thats on the flat after a bit of a runup obviously! With GPT that equates to 97mph actual.
I drive to the south west of France a fair bit and regularly cruise my current facelift T2 the same as I did my old round headlight one, i.e. indicated 90mph with more pedal to go, travelling for three hours or more at a stretch until fuel light comes on. Never had a problem and still does 23mpg at that rate of knots.
But got to say, the cruise control (aftermarket) was an absolute blessing to avoid back/leg ache, and the Tunit has made a very big difference to general cruising and especially overtaking.....but buy refurbed on ebay, they come up a fair bit.
Interested to see yr comments about the Mazda B2500 as I looked carefully at that (or the B50 anyway) ; seemed to fare as well as or better than the competition. I wouldn't have a Nav after all the problems and it boiled down to the Isuzu or the Mazda - lots of the former in Wales and seem to fare well, the Mazda much rarer but apparently very dependable....has that been your experience? Still can't decide as it seriously pisses me off that I can drive a fully loaded T2 LWB pulling a fully loaded Ifor Williams twin-axle trailer over the Severn Bridge for £5.40, yet an empty pickup is £10.80!!!!! Ba5tard5!!!!