Will the 5 weight handle bigger flies like frogs, bigger woolly buggers, and clousers? I'm honestly asking because I don't know. I will be fishing a bigger river from a boat more often than wading if it makes a difference.
ETA: Also, what about carp? I use to bowfish this river heavily and can get on carp pretty easily on days that other fishing is slow, getting them to take a fly is another story. But it's something I would like to try and have a chance at landing. 10-15 lb carp are common, with 5-10 being average. When we did tournaments our big 10 weigh in would be a 15 or 20lb average. I'm not saying I would target carp this big, but it is a possibility. Grass carp are also fairly easy to find.
I don't want it to come off like I am trying to talk myself in to a rod and not taking anyone's advice, I just want to open up my fly fishing options in a place that only has stocked trout once or twice a year, and be sure I have the proper rod to do it.