Though it is part of the rationale for reasonable suspicion to detain persons, I’m pretty sure the courts are fans of “specific and articulable facts.” I’m failing to see how these specific vehicles posed such a danger.
Can a peace officer temporarily deprive a detained person of a baseball bat for everyone’s safety? Yes, of course. Can officers round up all of the bats at little league practice “just in case?” Of course not.
Also, when the word “possibly” is doing the heavy lifting in your explanation, you are on shaky ground.