The trailers
Both are bob trailers, the grey one has a yoke for a 26 inch rear wheel. The green one has a yoke for a 29 inch wheel. When i run the fat tires on the pugsley(green bike) i have to use the 29er yoke.
As has been stated the trailers are no longer made. The trailer hooks up to a "old school" quick release on the rear wheel. There is a company that has been stated, called the robert axle project that does allow some new school rear hubs to have an attatchment for the bob trailer. The first animal i packed out on the bike with the trailer was in 2002, i have packed 20+ elk out with the bike and trailer. Typically backpack the meat to the bike and ride out. I have found gated forest service roads much easier to work with than singletrack trails.
I do ride bikes year round and have been mountain biking since 1988, so the bike style hunting comes a little easier to me. I started hunting off of bikes in the early 90's when i was living in alaska. But that was more of a take apart 22 carried in a backpack and went looking for spruce hens. The bike style is truly a style i love, but i have done quite a few sufferfest's on bikes. one thing to think about is, the bob can be a pain in the ass loading with the single wheel, but the trailer tracks really well. In snow, the little tire can and does pack with snow. I had a pretty good wreck on wednesday riding my mtn bike, my mind wandered on a skinny trail, with a steep drop off on the side, i ended up 10 feet down the hill very quickly. Basically shit can happen quick. I have almost blown curves multiple times, going downhill with to much weight., but hydraulic disc brakes have helped that quite a bit.
some things to think about with this style of hunting is: bike shorts under your pants or not? How do you manage sweat, do you lock it up? did you just have a massive wind storm that dropped all kinds of trees accross the road. That was a bitch last season, getting my camp out. This style is not for everyone, but at 57 i am still planning on this system again this season.