Rudnik

I actually do both. I put one in the truck and one in the trailer. My trailer is not quite big enough for both machines, but I plan on buying an enclosed trailer this spring that is big enough for both. Both have good and bad points as I see it:

Truck:

Good Points - The truck will be more economical if you already own it. It costs more in gas and plates to pull a trailer. If you own a car or suv, this would not be a consideration. Not worth spending $25,000 on a new truck. The truck is also less work. No hooking it up and backing it around. Plus if you stay in a hotel, you won't have to park in the back forty with your trailer.

Bad Points - My atv is scratching and denting the crap out of my pickup bed. I also don't like loading it. I have seen people fall off the ramps and take nasty spills. Also, with the atv in the back, I lose most of my cargo capacity for firewood, etc.

Trailer

Good points - Trailers tend to be easier loading and you can get more on them (depending on size). I pack my trailer pretty good with camping and atv accessories a few days before the trip and back it into the garage. When its time to go, I hook up and go. Trailers also come in very handy for helping friends move. No wait, that is a bad point.

Bad Points - Tend to be a pain to back and maneuver. Also, another thing to maintain and buy license plates for. When we go to southern Ohio, I have to drive through Columbus, generally at rush hour, and pulling a trailer tends to be a real pain in traffic.

All in all, you have to look at your situation and buy/use what suits your needs best. For me, I like to be spoiled so I will be buying a 14 foot enclosed trailer that I can deck out with tools and riding gear. I could get by with what I have, but what fun is that .