Which Rivet Squeezer to buy?

I recently bought a buck riveting kit and am looking to purchase a rivet squeezer for various jobs on my trailer where bucking may not be the best idea.(currently, my window sashes) and alos pick up some soft aluminum rivets to use with the squeezer.



I see sizes from 1-1/2" inch REACH up to 6" inch REACH but really not sure how much "REACH" is really necessary to cover the select few jobs on the trailer.



thank you

Eric