Can the 3 year old sleep on the sofa?
Get LEDs with as few elements on them as you can find. I used the ones that look like miniature ping pong paddles for the BR and the large rectangular ones for areas that needed more light. eBay was a good source. Here's an example; be aware that you may have to shave the sides down a tad with a knife to get them to fit.
http://www.ebay.com/itm/10X-Wedge-T10-24-SMD-LED-194-921-W5W-1210-147-168-192-RV-Light-Lamp-Bulbs-White-/131676555203?hash=item1ea888c7c3:g:f24AAOSwhkRWb4KU&vxp=mtrWe kept the short queen and bought a 4" queen memory foam topper. It hangs over the end but doesn't sag, and is much more comfortable than the mattress was by itself.
When you say the TT was level - how did you measure it and where? Maybe it was really off level? Keeping the TT off level can affect the ability of some systems (I usually see the fridge cited) to run off propane, which might not be a factor for you.
Only other thing that comes to mind on your post is that you may want to take the TT places occasionally to avoid dry rot on the tires.
Glad your TT is working for you.