As to cooling down the fridge the night before a trip, if you aren't hooked up to shore power, you'll wear the battery down if you use 12V to cool down the fridge before you go. You'll need to leave your home with a fully charged battery so your break-away switch works and you will have power when you get where you're going (if you're dry-camping). You might have to rig up some way of feeding power to the TM while it's closed.
On our TM, we didn't have a door latch at the top of the top half of the door, it's at the top of the bottom half of the door, which works for us because when you're putting the door together, the top half is secured while you swing the bottom half parts in and around. Ours looks like the plastic "baggage catch" #48120 here:
http://www.rvadenver.com/latches_and_fasteners.htm
but you could probably order it from TM.
We take our bikes in the back of the pickup, some people think it puts too much weight on the back of the TM and causes sway, but there are many threads on that.
Are you referring to the plastic bed rails that the support arms swing in and out through? We got replacements from the TM factory, they were plastic, and they work just fine. The trick is to get all the washers and plastic in the right configuration and adjusted with enough space, but not too much, so that they perform smoothly.
Custom RV in Anaheim has a TV hanger for a flat screen that hangs on the bathroom wall, we won one at the TM rally in Petaluma but I haven't used it because our 12V cube TV still (kind of) works. If you're interested I'll post a picture of it.
What curtain rails are you referring to? The ones on the ceiling, or? I ordered a replacement ceiling rail from the TM factory.
Got to go fix dinner now...