preface that - this is purely my opinion, but....
post away, some bpl'ers want a shot at your gear too, maybe - even if it is heavyweight...
UNLESS your thread is chosen for a rare and random misconstrued as "crossposting" attack by readership or others, there should be no issue with your described scenario
crossposting has been clarified by some here as listing your wares on additional topical areas of bpl itself ie: Gear swap & Gear deals simultaneously,.. posting elsewhere in the WORLD, not so much an issue.
ps. also links to other sale sites (ebay) frowned upon Greatly