SO 805 your statement "Wait until you hit soft sand or mud, those pizza cutters will really dig in and not in a good way"...I don't understand! The vehicle basically has not increased its pressure per sq inch on the road as the surface area contact with the road is maybe a little bigger with the 19.5, why would it dig in any worse then the lessor diameter tire with the same surface contact area?? The physics is lost on me..if you could enlighten.
Now if you speak of the tread design, M143 is a highway tread, gives a smooth ride and good steer components. On my truck I am a dually (not touting DRW over SRW) this is for tread design statement only...the rears are a lug style for getting thru snow ands some softer surfaces and I am only a 2x not 4x4...I don't have issues. In fact, I have been some places pulling my boat and had folks come over to look at rig and say "Ain't it great to have 4x4 to get up here"...when I expalin it is just a dually with posi rearend...their jaw usually drops and they bend over to have a closer look.
So from my limited experiences of soft surface and such...I'd say it is to each his own and you drive your tread style the way you want...I sure am glad I have steers on the front!
Buzz...great pics lovely weather for you! Wish I was out there.