We just got back from a two-week trip around Nootka Island and area, living completely out of our kayaks save for fresh water and two ice-cream sandwiches bought on the first day in Esperanza. We had, i think, seven meals requiring dehydrated chicken, so I prepared (in two batches) a frying chicken, three large legs and two enormous chicken breasts in advance. I started by bbqing them in a covered roasting pan, then removing all the 'easy to get to' meat. Anything left (ie bones and skin) was then boiled, using the water for a soup stock and the rest of the meat for dehydrating. Thus, all of the dehydrated meat started out fully cooked and very very moist; it fell apart quite easily. I dehydrated each on the solid sheets in my American Harvest dehydrator.
When re-hydrated for an hour or so, the chicken was firm but palatable (we were not picky eaters after paddling long days on the exposed rugged coast of Nootka Island!). The last morning I used some in scrambled eggs (yes, we had an egg left on day 15 and it was excellent!), so it didn't get more than 5 minutes to rehydrate but was still good, if a little tough. If we were able to rehydrate our dinner chicken starting at lunch time (ie 4+ hours), it worked perfectly - not tough at all. I can't imagine a way to get better, 'softer' chicken before dehydrating so I'm not sure it would be possibly to rehydrate any better, but I was impressed and will certainly use this technique again.