Greg Birch's grandfather was Alex Birch who worked for General Motors and had a big role in the development and testing of the GMC motorhome. The Birchaven model is named for him. Here is a presentation that Greg did at the Fall 2014 rally at Manteca. Greg's grandmother and Alex Birch's wife Beatrice passed away earlier this year and several significant mementos of Alex's GMC motorhome career were passed to his heirs. Pictured are some plaques and a fiberglass model of a GMC motorhome that was made by the some of the shop guys that Alex worked with and presented to him by them.