I used whipped icing because I had to "whip" this cake together after I left Sunday School and before a 1 p.m. dinner for him. You can tell it was thrown together. The whipped icing does not set like regular buttercream, unfortunately.
I sculpted the cake from a sheet cake. Just stacked layers and crumbcoated. The windows are made from fruit rollups. The air conditioner on top was an iced vanilla wafer. The tires were made out of mini-oreos. The tail lights are juju fruit candies, as well as the headlights. The pretzels on top were a last minute joke because FIL always pulls his metal antenna out when we camp with him.
The camp dirt was just crushed cookies. The parking lot logs are the Nestle stix of those chocolate crispy rice candies. (my brain is alluding me of their actual name...) The campfire logs were made out of chopped up tootsie rolls, with a red fruit rollup as the flame, and a fire ring of milk duds.
Camp chairs are airheads molded around a pretzel base. Note: Airheads are not a easy thing to use...they tend to melt easily and by the time the cake was cut, they were melted messes. Picnic table was made out of graham sticks with an airhead tablecloth (last minute idea).
The decorating took less than 1-1/2 hours. I lined the camper with canned yellow icing to make my life simpler since I was under such tight time restraints. Easy as pie to sculpt and decorate!