Greetings all, My new 09 GW1800 is nearing 10K - has factory Dunlops. I'm a bigger guy with big Spouse and Kids. Towing long distance too. Starting to get a lot of growling and semi cupping on the back. Looking for advance info before "the time comes" to replace. What's "the best for the above issues. I've heard Dunlop 400 series?