A good hacksaw is very useful since it can be used to cut PVC, copper, or steel pipe.
Given the tight corners in which you frequently find yourself when repairing mobile homes, a mini-hack is also useful. This is a tiny hacksaw blade holder that will let you work in places that are to tight for a regular sized hacksaw.
Power saws are where things get interesting; both pricewise and potentialwise! There are a variety of types that will be useful, depending on the project you have in mind.
If you plan to add steps or build a deck then a cincular “Skill” saw is probably what you want. They are good for making long, straight cuts in plywood and planks. You can also set the cutting depth to make notches or grooves. The high end models will have a “worm” drive which is a desirable feature.
In my work, which did not involve many decks or other heavy construction, I actually found that a “jig” saw was more useful.
This is a saw with a thin narrow blade which is rapidly pulled up and down through the work.
You can buy a variety of blades for cutting different materials. Where I found it the most useful,
was to cut out the sink opening in a new countertop. With practice, I could cut sheets of plywood, but it is very hard to get as nice a cut in plywood as would be possible with a circular saw.
The ultimate “macho” saw for the mobile home renovator is the “Saws All”. That is actually a brand name for a reciprocating saw. These are great tools for demolition work and, with care, can be used for many other chores.
However, you are working with a tool that can hold a 12″ metal cutting blade and has the power to pull the blade though almost anything. If you had an old mobile home you wanted hauled to the dump but didn’t want to pay a mover, I am confident you could reduce the entire home to pickup size pieces with this kind of saw.