You know, I love the GRCS--and it is capable of great lifting tasks (esp. because of the 2 speed winch). On the other hand, I do a lot of big removals for which a second bollard would be nice. Last week we did a 36" DBH Doug fir next to a house and driveway. Anyway, about 20 ft. up the stem splits into 2 codominants and at the widest part becomes about 48" diameter. We pull over that fat piece (approx. 8ft. long), 4 wraps on 5/8" Dynasorb, and it just stretched down to the ground and punched a crescent shaped hole in the pavement at the base of the tree. Yeah, I should have put a round at the base of the tree to absorb the blow, my bad (and my cost, too!)
Having 2 lines with 2 blocks on the big wood would have a great benefit in slowing and handling the piece in tight quarters. Rather than getting the Stein Dual (a little pricey)--I think I'll get the Stein single (500 bucks) and have a nice double, then, when I use it in combination with my GRCS. I have used it double with a port-a-wrap, but I believe the pieces will run smoother with bollards of roughly the same size (e.g., the GRCS and the Stein).