I've added 3 shelves and the over-the-stove cabinet to my TM, in addition to the OEM rear bed TV shelf that came with my 2005 2720SL. I made a shelf approx. the same size and configuration as the OEM TV shelf to create some extra kitchen counter space, and mounted it to the right of the fridge toward the couch on the lower wall. Since it's near the electric receptacle on the side of the fridge, it's a good place to set the coffeemaker, phone charger, etc.
I recently added an 8" x 24" shelf on the LR wall between the windows on the street side, on the upper shell section. On my TM, the inner wall section between the LR windows is a thin plywood rather than sheet metal. This shelf holds a 19" flat screen TV/DVD combo purchased at Walmart that weighs under 10 lbs. I originally thought I'd hang a flat screen TV mount, but then discovered the TV would sit closer to the wall if it was sitting on a shelf, and that the shelf would be more versatile as it also holds the remote, DVD case, etc. Now we can see the TV from the kitchen and the LR at the same time.
I like to read in bed, but don't care for the fluorescent overhead light, so I added a small shelf on the wall next to the wardrobe in the bed area. This shelf is the shape of 1/4 circle (about a 10" radius), and holds a small incandescent lamp, the TV remote, glasses, etc. I run the lamp cord behind the wardrobe and plug it in at the receptacle next to the microwave drawer.
I've used flush mounts for all the shelves, either ordered from TM or from Rockler,
http://www.rockler.com/product.cfm?page=346. I attached the wall sides of the flush mounts using 1" #8 hollow wall anchors from HD. This is the way TM mounted the hanging cabinet and TV shelf flush mounts in my trailer.
I also used a smaller thin flush mount to make a wall mounted shower head mod. Using flat head sheet metal screws, I screwed one half of a 1" flush mount to the back of a plastic showerhead bracket (purchased at Lowe's) exactly like the one that comes mounted near the shower tub faucet. I then screwed the other half of the flush mount to the street side wall of the shower, also using sheet metal screws (and a dab of caulk on each) instead of hollow wall anchors since this is a light duty application. So far so good.
Had already done a shower curtain mod years ago to accomodate a velcro wall mount for the OEM hand held shower, on the street side wall above the tub faucet. When I upgraded to the Oxygenics showerhead recently I found I needed a stronger mount.
I've made all my shelves from inexpensive prefinished shelving and brackets from HD or Lowe's, found in the home organization section. I find that this shelving is generally lighter weight than what I find in the lumber section, with nice finishes and a selection of stylish brackets. I've been able to get some really close prefinished matches to the wood color/grain of my TM cabinets, and found shelf brackets that match the ones that came on the OEM shelf - I'm very particular about my trailer decor!
I also love the Command picture hanging strips for hanging pictures and they can be used for other small items you want to hang on the wall. We hang a small dry erase board near the door to keep track of things in the TM that need to be replaced after an outing. We just pop off the dry erase board and take it home with us 'til the next trip.
Need to take pictures and post them, but always forget when I have the trailer set up!
Betty