I ran the permacool dual filter set-up on a '66 Bronco that I ran in the dunes...baja style. The unit cracked on the cross-over between the filters. No catastrophic failure but it was leaking pretty good. I am considering running it in my boat but have a deep V, not sure yet. For those flat bottoms boys, that get beat up in the rough stuff I would think twice about the dual set-up with big filters. Looks like Lakesonly has had good luck though. If you go dual, keep an eye on it. :boxed: