Hello Dave and welcome from Virginia. I am one of the guys who ride all year; put 20K miles on my 2014 R3T the first year.
I also admire the Rk as it was on my short list before buying the Rocket. In almost all areas, the Rocket out-preforms the RK except in slow speed competition like the Top Cop trials. It is hard to beat the RK there as it handles very well with great balance. With that said, last Independance day I was only beaten by a Sportster in the slow speed races on uneven grass while riding my R3T. (I am not supposed to mention the wienie races as pretty Pillion is shy about that so I won't).
My bike is seldon clean but it is never dusty. I squirt it off once in awhile and try to keep the wheels clean as they are the roughest part of the bike to stay nice. The bike is as easy to clean though as any other big machine, the bags come off easy enough as does the wind screen.
The RK has a shorter wheel base which I think makes it a bit rougher on the highway but that may just be my opinion. For me, the R3T is a perfect mix of all things I like in a sturdy road bike.