Our CG allows decks, but they have to be at ground level. Not elevated to camper door height. I'm assuming because it's easier to disassemble and remove if it's not on piers. I hate the deck on the ground, I'd rather have stairs leading off the deck, than leading onto the deck.
One smart camper found a old camper frame and built his deck on that.
Once in place he blocked the frame up so the tires were not on the ground. If he decides to leave the CG, he can hook up to the trailer and bring it home. Deck isn't on piers, and the CG was happy.