We have come up on this question many times, as well.
We live in Illinois, and for our troop identify the following as "Scout Camping", beginning with the Camping Merit Badge guidelines:
At a designated Scouting activity or event:
(1) Sleep each night under the sky or
(2) in a tent you have pitched
We added
(3) Wilderness Survival shelters, including "undeveloped or non-commercial" caves
(4) Snow Shelters or similar winter shelters.
From our interpretation we do NOT count
(1) Any cabins
(2) Sleeping in a car, other vehicle or camper, RV.
Having said that, our District Execs did state that it was up to the Unit Leaders interpretation.
