We just ran it last night and it was screaming (compared to the last 6 times I've run it these past weeks). Personally, I think a 15' Oar Rig is a bit of a stretch as it's very curvy and tight in places not to mention hauling it all over the RR tracks. Just below the confluence of Hurd Creek about 1/2 mile there's a cable which we (on my 11-1/2' Otter - paddleboat) had to limbo under so there's potential for hang-up with your frame.
It's definitely worth doing because it doesn't run that often, I'd just see if you can get ahold of a smaller boat and assemble a paddle crew instead.
Have fun and be safe