Plowing:
Duals:
90% of the time they are weight, the other 10% of the time (deads, rough areas, etc.) they are very useful. Some of the pics below show an 8.50 Stone with a 6x12 Carlisle dual. The Stones are 1.5" taller to start with, so it's very likely that the dual will be high sided. As was stated below, the track width is so narrow compared to the furrow depth that duals really don't have a chance in firm soil (the light, great plowing soil below is the exception)....if you get behind a deep plowing 12" the dual is up in the air.
Tire width:
6x12, 8.50, 10.50, 26x12.....they all work and they all are much more dependant on WHO you are following at PD than any of their other own qualities.
6x12 following 12" plowing deep...fits in the furrow like a 4 lane highway, but you are likely not going to have the traction or clearance to not get high sided......
26x12 following 6x12 pulling 8" or 10" plow.....opposite, not nestled down in the furrow, garbage truck in a tight alley, plow not level, rough ride up on the previous furrow.....
10.50 following 10" plowing not set right....riding over clumps, obstructed furrow thats more like a pot hole infested road....
Point is, if you are plowing by yourself, always in your own furrow, you can optimize your set-up and plow in a predictable, repeatable manner......no matter what your tire size, etc. Plow days are great fun, but they are not like that....you are following a little bit of everything and you can't expect perfect results in those situations.......just don't blame the tires or plow...instead find someone who plows like your rig does and run with them. This is why you often see groups of 12" plows running together, or see people waiting at the headland for their "turn" to come up......they have found a system that works....
Weight:
More high than low. Not usually 2 weights past the rim on the furrow side, one to 2 more on the high side than low. More weight is better most of the time. Front weight is optional, but if your rig tends to pull the front end whit a well adjsuted plow, by all means add weight in front.
Trash:
The fresher the bean straw, the worse the trash problems...2x if it's rained in the last 24 hours. Narrow tires have a clearance advantage here, but spin down to a high center situation faster as well. Taller tires are a big help, 26x12 rubber offers extra width (clearance) and height (clearance), as do 8.50 Stones because of their increased height. 10.50 Titans seem to be at a small disadvantage because of their slightly shorter flat profile. Trash problems happen in 3 places, at the sleeve hitch pin (gotta keep it up off of the ground), under the rear end (usually after running over a pile of trash from a previous plow when plowing deep), and at the hitch/inner fender well (Cat 0 3 pts with 10.50 rubber are very bad for this, 10.50's in general can be, and 6x12, 8.50, and 26x12 are somewhat immune).
I'm considering adding a poly skid plate from the hydro filter to just behind the lower 3pt bracket on my plowing machines to help keep trash moving along freely.
Plows:
I personally think 12" plows do the best job, but they pull the hardest. 10" are second, and the 8" are OK, but not when running in big groups. the 12" plows respond to higher speeds and deeper depths better, IMHO.
Plow fixes. Trash clearance is a must...cut it and clear it. No rolling cutter is NOT the best trash clearance fix IMHO, a good cutter that gets it done without adding to the clearance problem IS... Fix the rolling cutter about 1/2" to land, move it forward, and notch it. Notched cutters will keep turning, mount trash, and saw it in 1/2 so it won't drag on the beam...trash cannot wrap the beam, that leads to a choked up plow sooner or later.
Keeping the sleeve hitch joint up off the ground (see my plow pics) is a big help. The 5/8" sleeve hitch pin protruding below the adapter will cause trash to drag and eventually choke up under the tractor leading to a high center situation.
A good land polish is also a must, and keeps everything flowing cleanly.
I'd like to add about 30# to the landside/frog of my 12" plow to help with penetration and allow for a flattened out point angle.....resulting in a better job of plowing in harder soils and less draft load.
In the end, it's about getting a good combo for your plow and tractor. 8" on a SGT is a rocky marriage, as is the opposite, but a good balanced set-up matched with other tractors at PD with similar set-ups leads to enjoyable plowing. Watch what works and what doesn't and work toward that.....and HAVE FUN!!!