Generally: Don't be a jerk (unless you have a good reason).
Manufacturer participation is welcome as long as your affiliation(s) are disclosed. Badmouthing others products will get you the evil eye pretty quickly.
Dealer participation is welcome as long as your affiliation(s) are disclosed, and you don't treat this site like your storefront or free advertising. We do have competitive advertising rates if you would like to advertise your business, please email [email protected] for more information.