Do you let any maintenance items go longer than recommended?

Oil every 15K not each year. Wheel bearings every decade. Generator when I need power. Tires 7-10 years on MH. Two year old used tires for my many trailers.
So YES there are a lot of things but only been doing it for five decades. Time will tell if I'm making a mistake.
PS: I crank my Diesel engines when I need them, not before.