>>Any advice on training patterns, incorperating weight workouts or interval training? Information on nutrition while hiking longer distances would be appreciated...<<
Over the past 3 years or so, I've done about five or six, single day, 50 mile "hikes" each year.
Personally, the only training I do is hiking and trail running. Mostly just "big" miles on the weekends (20-35 miles per day), with one or two short runs during the week (5-10 miles). I usually just carry whatever is necessary. If I'm out for a backpack, I carry more weight. If I'm out for a 5 mile run right from my front door, I *might* carry a water bottle.
As for nutrition, if you're just talking about a single 50 mile day, I prefer to mostly eat lots of little bits of "real" food. I do lots of rice/bean/quinoa burritos, and PB&J wraps. Cookies and brownies are good, too. I supplement that with various gels (I like Crank Sports).
If I'm trying to really cover lots of ground with minimal weight/volume, I make a sugar/Morton's Lite salt/water "slurry", and slurp it up with a bunch of clear water. Doesn't taste great, but it works.
Most others I know use more "advanced" nutrition, but I find the simple (and cheap) stuff works for me. I'm definitely not setting any world records or anything, though, so...