Mounting pressure washer question

I have mounted my new pressure washer in my enclosed trailer and everything works great. I have searched and couldn’t find (or I’m using wrong searching criteria), but how tight should I tighten the machine to the floor? I have rubber feet between the machine and the floor and have through bolted it with locking nuts. Should I cinch it down tight or just snug it up to allow the feet to absorb some of the vibration? How do you guys mount yours?

just snug it up to allow the feet to absorb some of the vibration.

5/16 bolts right through the floor. I used some angle irom to mount it drill through the stall mat then right through the floor.

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Thanks, I assumed snugging it up was the way to go. Kind of a basic question but thought I would ask the pros.