Here's a start..... Somewhere I read of a person slipping a foam tube over the end of the gutter. I don't know if it was like a 'pool noodle' or foam pipe insulation and I have no information on the diameter or length.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.