Yeah, that's primarily what I use mine for. 300+ mile days, no problem.
The early 80's are pretty fuzzy for me, but as I recall, the 1100 series was Suzuki's flagship. The "E" series had all the bells & whistles they could come up with.
It's really kind of a dual personality machine: under about 5k rpms its quite calm & sedate, but whack the throttle up around 7 or 8k and HOLD THE #$%* ON!
Gobs of torque, too. It really is like a freight train. There is nothing subtle about them.
A sixth gear would have really helped, tho.
-JP