The best thing to do is to have two different pairs of shoes. The main difference with a trail shoe is the traction for loose ground and wet surfaces. If you run the trail shoes on the road that will most likely wear out faster. Sometimes a trail shoe will be built a little stiffer then a road shoe to handle more twists and turns. I guess it all comes down to what you are looking for in a running shoe.
If you want something with more control, support and cushion then a traditional shoe like the Brooks Ghost or Ravenna would be options to look at. If you would like to dabble more towards "barefoot" running you may want to look at a more minimalist shoe. I recently bought a pair of Nike Free Run +'s and love them. Very light and very flexible. You can still heel strike in them but they do make you want to strike more forefoot or midsole. I think they are a good intro to minimalist shoes. They are pretty much right in the middle of a traditional shoe and barefoot running. Different, but it can be really enjoyable and can actually help prevent injuries by working more muscles that you normally don't work in a stiffer, traditional running shoe.
"The only defense against violent evil people are good people who are more skilled at violence" - Rory Miller
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