This is Mike from Outdoors with the Morgans, I agree with the others 900lbs would be too much for the 37. I have run the RK 37 now for about two years with the 72" Granite Grapple and it works fantastic. I use it for rooting out invasive scrub, carrying brush piles to burn pits, carrying logs (lots of logs) and use it to load logs on the sawmill and even carrying lumber from the mill to where I sticker and stack the lumber. I can't tell you its the best grapple out there because I haven't used them all, how would I know? But I will say I am very pleased with the granite grapple. Either the 72" or 60" would work well on the 37. On thing in particular that sort of stands out on the granite grapple compared to many others is the design of the bottom teeth, the are very heavy duty and designed flat, not curved. What this allows me to do is also use the grapple as short forks along with as a grapple. This comes in very handy when picking one log out of a pile. You can go in and lift one log up back away from pile then close the top. Its difficult to do that with some of the others because you have to close the lid to get ahold of something. Also the flat teeth work well for stacking lumber on, I can load it up with boards from the mill then close the top and carry them to where I stack.
