I can give you some data points.
Well, I have had some similar blades for years. Some of what I've found might help. The little blade is a Land Pride RB3572 which is their medium duty 6 foot 3 way blade. We also have an 8 foot Servis Big Rhino WM3 which is a much more heavily built 8 foot version of the same. The Servis brand pre-dates Land Prides offering, but looks very much the same. In Land Pride designation the WM3 would probably be an RB4596 or maybe a 5096. Both of our blades have end caps and both are 3 way manual adjustement.
I pulled them for snow and road maintenance here in the mountains. Snow could be deep, and the roads are crudely built - mostly by bulldozers - through crumbled granite, gravel, and sand. We don't have much dirt, but a bulldozed road is pretty good for durability. Both blades were hooked to 30 hp tractors and matched their tractors pretty well. The smaller blade was mounted to a 3500 lb, 33 hp 12 speed 4wd Yanmar - that's your typical Japanese compact tractor of a few years back.
The larger Servis WM3 blade is Category I/II, & was hooked to a 30 hp 4 speed JD530 which is a 5500 lb plus tractor much like an older JD B or A. It's your typical Ag tractor.
Both tractors pulled their blades about the same, and for each one that was all the blade it wanted to handle. BTW, both tractors have a good functioning automatic draft control which was a big help.
When grading in dirt (sand & gravel actually) with the blade at an angle I would leave the "downstream" end cap installed and remove the one on the end of the blade that was closer to the tractor. In that way the blade acted like an angled box blade and could pull a pretty good load of dirt. Pulling a load of dirt along helped a lot in rough ground when I was filling in low spots, washboards, and divots. Especially washboards.
The 33 hp Yanmar at about 3500 lbs with weight could not handle the big heavy 8 footer. It had no problems with its 6 footer. The John Deere could handle either, but since it really didn't have any trouble with the 8 footer that's what it used. It could handle a full load of dirt and any angle or tilt...but neither tractor could handle any more than a small offset of about a foot.
We have a Kubota
M59... a 59 hp 8000 lb tractor with a Cat. II 3pt hitch, but unfortunately I've never hooked either blade to it. My guess is that it could handle more offset just because of the weight. But still a couple of feet of offset is a lot.
I don't know if this has helped any; my feeling is that unless we are using different blades on the same machine in the same dirt then it's pretty hard to compare.
rScotty.
