Bill,
I would only use a Cat secondary fuel filter, but the hydraulic and primary/water separator filter can be any good brand filter in my opinion. The Cat secondary fuel filter is a 2 micron filter that is critical in keeping any dirt out of the injector system, and not many other brands have filtration that fine. However the 30 micron primary/water separator is a normal filtration level (filters out sticks and leaves) that is commonly available from most suppliers as is the filtration level for the hydraulic system.
The change interval on filters is a personal decision in low usage situations. Cat recommends changing the secondary filter once yearly, and I would follow that unless you are comfortable in changing it beside the road if a restriction develops and you understand how to recognize when one happens. However, if you are using fuel from a major truck stop, and driving very little (3,000 to 8,000 miles a year), I see not reason that you can not stretch that change interval to as much as every other year.
The primary/water separator filter and hydraulic filter, I would change every 3 years or so unless you have other issues like contaminated hydraulic fluid or microbes (diesel algae) in your fuel.
Gerald