Here's my maintenance log for a pair of Toyotas that I've serviced since new. They were bought 6/04. One has 24K, the other has 22K. They have had severe duty use. They don't do much long distance fast type traveling but they do rev a lot and sit idling some also.

They are used 24 hour/day. 7 days a week. 100 operating hours per week each.
Oil changes done about every 400-600 hours. Trans oil done every 5000 hours.

Side lift cylinders started to leak right away so they were done once or twice.
Both radiators cracked at 10000 hours.
One water pump each.
Both hydraulic pumps started leaking at 16000 hours and got seal kits installed.
New chains at 12000 hours.
New ring gears at 20000 hours (not too bad, just unbolt and move motor back 6")
Both carbs came loose at 10000 hours and were locktited on.
Radiator, transmission cooler hoses, and fan belts 4 times.
Steer cylinders started wandering all over the place at 12000 so they were done.
Both machines have cracked 3 tilt cylinders each.
A few broken control levers.
Many tires, batteries, starters, horns, and horn contacts.
Spark plugs and wires as needed.

Now the things that have not been touched:
THE MOTORS AND TRANSMISSIONS
The brakes
The propane regulators
Mast and channel rollers
King pins
The center lift cylinders
Hydraulic control valves
Original alternators

Not too bad, eh? I do blow the dust out of the radiators and give them a check over every 4 days if I don't get called for any breakdowns.