I don't konw about an '50 but I've got a '46 Panel with a M II in it from JPL in PA. I don't think is sits to low,
http://hotrodders.com/gallery/showphoto.php/photo/18540/size/big/cat/500/page/1
http://hotrodders.com/gallery/showphoto.php/photo/18538/size/big/cat/500/page/2
The rear has air shocks and there is no pressure in them at the time these pics were taken( Adjustable coil overs after tax refund) The front tires are 235/15's and the rear are 29 X 18.5 X 15's
Hope that help you figure it out a little


David
Just a firefighter,
Cleverly disguised as a responsible adult
'46 1/2 T Panel