you should easily be able to bunny hop an UltraLight touring bike.
in the dirt you should be able to easily maneuver the bike/gear just as you would expect to a XC bike.
you should be able to easily pick up the bike and walk across/over things like fallen trees, etc...
you should be able to shoulder the bike and have one hand free, and comfortably walk with the bike, while going up a set of stairs.

for all intended purposes, if you can do 100 miles of dirt in 12hrs, an UL touring dirt bike, you should be able to come close to that same outcome.

on the road, if you can do a century with 6000ft of climbing in 8hrs, you should also be comfortable with a UL touring road bike.