My son put a set of these on his '69 Bronco. He's running 33x12. 50-15 C rating for the little Bronco. He was running the older tread design BFG mud-terrain KM's before these. They work really well rock crawling with allot of biting edges. They seem to have the same road manners as the older KM's, no better no worse, but I don't think they clean out mud as well. So far he's really happy with them. I don't know how well they would do on a heavier CTD. I saw they come in a E rated 285-75R/16 3700 lb rating. I've been running the older tread design since the 80's on my jeep and trucks and I still like the older design better.
Regards, Mike.