I did about 25% travel for two years. Usually it was two four-day trips a month, and once it was 23,000 miles in one month. Sometimes I had weeks of notice, sometimes just a few days. I was always expected to be in the office the day after getting back at my normal time, whether we'd gotten in at midnight or not. It was tiring, but I got to go to some really interesting places.
Pros: eating out is fun, hotel rooms can be really relaxing, get to see new places, airline miles = free trips, I came to really appreciate my home, travel days can actually be relaxing if you do it right, going east coast to west coast means you get to feel like you're sleeping in
Cons: eating out is unhealthy and gets old quick, airplanes are the worst (although I built up this travel zen that I still have), travel is often stressful, there's ALWAYS unpaid travel time (and often long days on the road - working), hard to make plans and have much of a life (but not impossible!), hard to exercise consistently
Do you live near a major airport? That could cut down on travel time a LOT (one flight rather than two makes a huge difference). Also, is it predictable? That could affect your social/family life. Is it travel to different, interesting places? That keeps it fun and new - going to Overland Park, Kansas (no offense) all the time would be awful. Will you travel alone? I really liked the coworkers I traveled with - same ones all the time - so that really helped. Will you get comp time for overtime? Will you have to spend hours on the phone with airlines and hotels when plans change?
One thing that made my job mostly fun was that I was a videographer. When I was traveling, I wasn't answering emails or editing video or doing anything other than waiting to get to the new place so I could start working. We always went to new places, saw interesting things, and worked with new people. The hauling of equipment was terrible though.