Rob, I haven't ridden the 1300GSA but I did take a 1300GS out as a loaner once whilst my 1250GSA was in for a service.
I wanted to like the 1300GS but it felt flighty like a toy in comparison to my 1250GSA.
Riding home again on my 1250GSA after returning the 1300GS I felt way more at home on it.
I know you are a big chap having met you, Wappings advice is spot on..... Take a test ride, I'm only 5'11 in my bike boots but I suspect you may find the standard 1300GS a bit small for your frame.
I wanted to like the 1300GS but it felt flighty like a toy in comparison to my 1250GSA.
Riding home again on my 1250GSA after returning the 1300GS I felt way more at home on it.
I know you are a big chap having met you, Wappings advice is spot on..... Take a test ride, I'm only 5'11 in my bike boots but I suspect you may find the standard 1300GS a bit small for your frame.