The Low Wing Wonder
I don't think it's possible to change or add an autopilot, but wiser heads might know better. You should review the STEC manual. I've flown the Cherokee around the world with that autopilot and I was NOT constantly trimming. I know its "altitude hold" feature is a bit different but it works just fine for me. https://a2asimulations.com/downloads/ma ... -30alt.pdf
As ratty mentioned you shouldn't be trimming loads unless you are in some really dodgy weather, the Cherokee is pretty stable, you be trimming mostly as normal for power changes etc.
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