I am building a portable hunting cabin that will be used as a rv. It will be fully equipped with a 4.6 cubit foot refrigerator, a 5.9 freezer, a 2.5 gallon hot water water heater, and a 5000btu window a/c, 2 shop lights. It will have 4 outlets total, should I use a 30 or 50 amp breaker, and where where do I fasten all the wires from the outlets?

Well, if you hook all that to one breaker, you may not have a hunting rv for very long. Better get yourself in contact with an electrician that can take care of this for you before you have a fire.

Tie everything to a 50 amp breaker, and you are going to have to run #6 to everything. Likely cheaper and easier to pick up a small panel, size the main breaker to where the power is coming from and use the correct size wire.

Any inspection for it?

Keep in mind the "start up" amps for each item hooked up. If ALL items did start up at the same time. I would still have an electrician in your area do it for you.