We created a wooden cover for the burners of the stove to increase our counter space.
We also installed wire shelves in the wardrobe next to the fridge.
We use over the door hooks for towel storage, a 4 hook one on the bathroom side, and a single hook on the kitchen side.
We use a wire freestanding rack in the cabinet under the stove.
And instead of the shower guards others have mentioned, we just ran a SUPER large bead of caulk in that location. We made sure it filled the small channel between the shower pan and the shower walls. we then hooked the bead back into the shower pan area, so any water would travel down that and get back into the shower pan.
To combat the shower curtain attacking us when we shower, we actually have 2 curtains hanging there now. a longer brown one from walmart that I modified on the bottom to make the side by the shower drain shorter and not interfere with the drain (sewed it at the bottom at an angle), and then the stock one on the inside. When they get wet they stick together and don't attack you.
Oh, yeah, this past winter my fiance created a bracket for the slide motor because we had a small problem with it shearing a bolt out when we were packing up from one of our boondocking adventures.
That said, we love our camper. We've looked at so many before and after our purchase and none have the features that the 2109 does that we now realize are the most important to us!