There's a place for remarks on the form, add the fact that you're going to use the 89 Perf tune as a daily driver and would like it to be as economical as is reasonably possible.
For your 89 tow tune, simply tell Bill your trailer's weight when you tow it, and, if you have additional weight in the bed of your truck. I'd give the speed you maintain when you're towing and you might add the "frontal area" of the trailer (height x width) since that's what produces wind resistance, adding considerably to the towing load on the transmission and engine.
- Jack
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