Okay, so working alone you often find yourself falling behind the curve.  I just got my DisplayLink working the other night and today I found this little device – a 2.8" TFT resistive touch screen for the Pi. 

This is a much better solution than the DisplayLink for the trailer.  But if I spend any more money getting this thing working I may have to sell one of the dogs.  Eeek.

I'm going to keep going with what I have and then return to the touch screen option a little later.  I need to get to a fully functioning prototype before I go to cost -reduction and feature-enhancement mode.

You can buy this display via eBay.uk.  It's about $32US, plus shipping.  There is a discussion topic about it on the Raspberry Pi forums for the original version, which has since been updated.