The only one that I would recommend at this point is the brake fluid flush. Towing can heat up and brake down brake fluid. and as mentioned it absorbs moisture. I flush it on all my vehicles. Trans fluid I do every 25k, but I don`t pay for fluid and I drain it and refill with a new filter every other service. P/S flush is dependent on the quality of the fluid. I do my rear diff fluid every 50k.
Just because it isn't in the owners manual doesn't make it bad or a money grab. some places recommend them when they feel they are necessary, others go by mileage.
Fuel system service (not a flush) runs a cleaner through the injectors from a separate reservoir. you bypass the fuel pump and run it off the separate reservoir. I have never done this on my cars as its just a concentrated cleaner that you can buy and put in the tank.
As your post title indicates "Maintenance" Take care of it and it will take care of you!