Seat Quality and Upholstery

My '16 Tacoma is the first Toyota vehicle I have owned (outside of the 80's Tercel hatchback I totaled out as a teenager ).

I was wondering what the quality of the seats is like. I'm 6'3" / 230 so I'm a bit of a load.

How many miles should I expect to get out of the seats?

If I ever need to replace one, will they always be available through Toyota with the same upholstery?

 

While I can't speak to the longevity, since my 2016 hasn't been born yet, there are always options if they get worn out, or if you want a change. I'll be keeping an eye on this:

https://www.tacomaworld.com/threads/clazzio-leather-seat-covers.414702/

 

I'm not as concerned with the upholstery as I am the inserts (foam) and overall quality of a car's seats (springs, frame). I have had cars in which the seat began feeling like a torture device long before the upholstery wore out. I'm assuming Toyota would be happy to sell me a seat for a bajillion dollars.

 

I came from a Nissan Frontier. There are many Nissan sites that sell the seat foam components even for older vehicles. Cost for a complete seat bottom is about $400 and $800 for a backrest. There are some even available on e-bay. I'm looking for a Toyota site that has the same type of listings but haven't found it yet.