i have about 10k miles towing on my 33 ft tt thought i would check the brakes and pulled drum of to my surprise i only one wheel had any brake lining left i was stopping with only 1 wheel brake ...
I owned one TT for 32 years. In that time I pulled all over the west coast and mid west. Think big mountains.
I replaced the shoes 1 time and the magnets 3 times.
From what I have seen this is about correct for every trailer I have owned. If you drag your brakes you will wear your shoes and magnets out VERY quickly. Stab braking will save a ton on parts.