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TonyInPa wrote:
I've just spent the past hour searching the web for how to change brakes on my fifth wheel. I have also searched here. On the web I found a whole lot of buffoons, but not much more. I guess that's my luck, or lack of searching skill.

If brakes need changing what should be changed? Just the shoes? Or what else?

Is it worth changing just the shoes, or is it better to buy a complete assembly? Where do you buy this stuff?

And, in the first place, how do I determine if brakes need changing?

The links below will help you understand more about electric trailer brakes. If you do buy replacements and currently have 12x2 size -buy 7K rated assemblies for the most stopping power plus consider self adjusting units.
First manual is from Dexter Axle:
http://www.dexteraxle.com/i/u/6149609/f/600-8K_Service_Manual_3-13/Electric_Brakes_3-13.pdf

Second is from ALKo Axle:
http://www.al-kousa.com/pdf/ALKO_2kto7k_OM.pdf

Also, electric trailer brakes need to be adjusted much tighter than auto/truck drum brakes due to the way they energize from magnet pull and inertia. If adjusted right they will have a distinctive scrapping sound and only rotate about 3/4 to 1 turn with a moderate spin.