I have the same problem with my TT. One fix that I've seen is to stick a length of clear vinyl tubing over the gutter spout and run the end of the tube to where it's not a problem.
Not sure of the best ID to get- looks like a 3/4" inner diameter tube would push onto mine about right. A 3 foot length would probably be about right to divert the water to the front or back of the TT.
2011 Dodge Ram 1500 HEMI Quad Cab
2011 Jay Flight 26BH