With 5 previous coats of paint that are checkered and peeling, It's going to be pretty hard to stop that. But if you're happy with how it looks, Dan's suggestion of a "patina preserver" might work for a while. I'm not familiar with them.

If it's a nice straight truck other than the paint peeling, then I'd lean toward stripping it and starting fresh. But it's your truck.

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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.