We hunt deer on some forest crop land with good logging trails but no motorized vehicles allowed. Go back in about 3-4 miles usually. A bike with a little trailer makes it WAY easier to get in fast and quiet in the early morning (although logs and potholes on the road are, um, pretty surprising, in the dark at high speed). And we can load up a deer on the trailer for the "Ted Nugent Cardio Workout" on the way out!
We have lots of big hills so there are only 2 speeds- "grunt" and "careen". A mountain bike with knobby tires is way better for uphills under load than a crossover or road bike. It's geared lower, too.
Take off the factory seat and buy a nice wide padded one. It sucks to be on your stand all day with a sore backside. And that condition gets worse as you bike more days in a row....
In Wisconsin a bicycle is considered a vehicle, so until they changed the law this year we had to ride with guns cased. I prefer a revolver, easy to carry cased and bungee corded to the handlebars, but a cased rifle on the trailer is easy to transport as well. Uncased guns are just a bad idea- you will wipe out some times and it's a shame to scratch your rifle all up.
The little kid trailers work OK, but you need to reinforce the pull bar if you are going to load a deer on them. Even better is to build a lightweight cart that pulls from the seat post instead of the rear axle, it's more stable and handles better when loaded (like a 5th wheel trailer instead of a bumper pull).