I am inquiring to see if anyone else has ever experienced any form of sabotage or vandalism to their boats or vehicles when hunting the Haul Road? My father met me for a moose/caribou hunt in the vicinity of Cold Foot, and we used his air boat to access hunting opportunities outside of the 5-mile corridor. We talked to one other camp on the way in, but they were the only other hunters we encountered. After 6 days, and successfully harvesting a 58" bull, we came out early to take care of the meat (unusually warm temps were making proper meat care problematic). When we trailered the boat, another hunting party getting ready to launch notiifed us that a group of hunters were very angry about the air boat we were using, and felt that we had ruined their hunt by ferrying the meat by their camp. We thought nothing of this, and after ensuring that the meat was properly cared for, headed north of Atigun Pass to pursue caribou. After an additional 3 days and 7 caribou later, we were eventually headed back to Fairbanks when my father encountered truck problems. After changing 2 fuel filters, we finally limped the truck into Fairbanks before it died. The truck was towed to the Dodge dealership, where the mechanics found at least 5 pounds of sand and gravel in the fuel tank. With the amount of debris, and the size of the gravel, the only explanation is that someone deliberately vandalized the truck for some reason. We are pretty sure that it did not happen while caribou hunting, as another hunting party was camped by our vehicles the whole time, waiting for parts to fix their broken down air boat. So it must have happened while moose hunting. Has anyone else experienced something similar? Were we in the wrong to be using an airboat on the river? Other than ferrying meat and our camp, we tried to stay away from the camp established down stream to avoid disturbing their hunting opportunities.