As long as your on a dirt road,it isnt off road. Guys have done the haul road in AK on Gold Wings and RT's.
They probably know how to ride gravel though. It really depends on a guy's experience as to how good a Big Twin ADV bike works out in the dirt. There is no stage presence involved in riding a simple 650/400 down a gnarly jeep trail.
Doing the same road on a fully loaded 1200GS with slick Tourance style tires is much more of a challenge,I dont know how people pick em up off the ground but they do.
2003 DR 650.(1976 Montesa 250 Enduro-nice!) - - 1990 MASI TEAM-3V.- 1976 Motobecane, Super-Mirage.- Kona, HumuHumuNukuNukuApua'a. Single Speed ThRaShEr BiKe. 1968 360 Greeves challenger MXer. 1999 Triumph Trophy 1200. 2011 KTM530 EXC. 2012 KONA Hei Hei Deluxe (ongoing bike issues) -2009 KTM 200XC-W.