Yes have spoken to a few truck drivers while working out over lunch and you can see your vehicle in the front parking lot so you can monitor as well but they've never had an issue. Think they're mostly concerned w overnight parking / long term parking.
There is a big parking lot aside. If you don't mind to walk about 80 feet, you can park perfectly there.
A No tractor trailer sign is posted at the Irby St entrance but trucks still park there. I suspect that if you have a Planet Fitness membership and don't stay too long, you may be ok.
I have seen semis parked in the back of the building before.
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