abn deuce, the whole vehicle goes 17 1/2 Tons (39,200lbs to you, which is 19.6 US tons :???). I'm sure the chassis was 10 tonnes on the weighbridge, so skid unit would be about 7 1/2 Tons.
The weight is not a problem, and the trailer must have been 26 Tons - not a problem for a Mountaineer. The trouble is the high centre of gravity, which coupled with the centre-pivot transverse front spring (common to Pioneer, Explorer, Constructor as well), means there is very little latteral stability.
But it does say max. speed 12 mph on the truck! That one too was fun loading onto a slightly narrower stepframe trailer - the rear left inside tyre was in fact flat (well spotted!) and had chopped the valve stem off, so the truck would not run in a straight line :argh:
Andy - I reckon the dodgems would be a bit too quick with 400 volts going to them :-D