I have a similar Roverdrive (probably predecessor of yours), plus taller (750) tyres. Tend to run at 60 to 65 mph though, again due to barn door aerodynamics
Of course I forgot our longest LR trip, in the pre-Defender 127, Culkein Drumbeg (Assynt) for a week. Still had the collie-X then, though it was his last year. We did get up to the north coast. round to Loch Eribol, to get a photo of HMS something or other.
We seem to have strayed from MGBs
