Cabinet and side wall repair

That is very strange about the cabinet. Mine is a 65 and a little different but not much. My cabinet does go all the way to the window.

The cabinets are usually anchored thru the rafters with screws or nails, so you pry won't be able to get them out without pulling the roof, at least not as easily. Sometimes, but not often... The closet is the same way but you can leave that in place. I'm hoping you won't have to take it all the way down and can save some panels behind the kitchenette and closet. If they are rotted, yup the cabinets have to eventually come down.

Also, I highly recommend switching out the type of paneling to birch if you can find it. The trailer will be worth a lot more in the end if you do. Everybody loves that golden glow! I hate the thought but am going to do that to mine. All of the cabinets and drawers will be refaced, frames look OK. Mine's got some nasty rot in the ceiling around the vent and by the bed. It's been VERY WET in it's life.

So, you can take some of the interior apart now. The wall patches for sure, cabinet facings if you want, take the drawers out, doors and the bottom of the sink drain apart, stove out, etc. The stove has 4 screws going sideways into the counter if you lift the top. That's usually all that's holding it in. Loosen the gas line (should be 3/4 on the nut and 5/8 for the little fitting on the manifold) When it's ready to pull, the stove will be "loose". If it feels tight, you've missed a screw... The icebox is usually fairly easy to remove, all but the drain. Take your time, not difficult. Take the lights down, they'll have to come out anyway.