Join Date: Nov 2004
Location: London, Ontario, Canada
Bikes: Surly Cross Check, Trek 520, Giant VT1, Norco Scrambler, Norco Unicycle, Dirtsurfer
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Many people have toured long distances using just about any kind of bike including mountain bikes and in fact some people prefer them!
With respect to handlebars it is true that many people prefer to have more hand positions then can be provided by a straight bar. You could likely replace the bars with a drop bar or even a butterfly bar but another alternative might be to just add some bar ends to your existing handle bar. This will often give you some additional benefit at a lower cost then a new set of drop bars especially if moving to drops requires you to changes shifter and brake levers etc.
Trailers are also a piece of gear that people have used very successfully. It is important to consider if the rear part of your bike is stiff enough to handle any flexing that the trailer might induce. This might be worth asking about at your local bike shop or as a secondary question to others who have used your model of bike.
Based on your question about skinny, slick tires I am assuming that you are likely to be riding on paved roads. If this is largely the case then you are less likely to need the suspension post.
Make sure you take plenty of spare tubes, a spare tire and some spare spokes and the knowledge of how to fix them if they break. An easy temporary spoke solution is some Fiberfix spokes.
Have a good time with your tour!