How would you use the topping lift. Do you drop the mainsail while you're out sailing on a regular basis? Imho, the boom and rig are pretty light so it doesn't take much to keep the sail filled and holding up the boom. Do you have a motor on your 16 footer. You just don't see small boats using topping lifts that much, most of them hoist and drop the main on the beach. I've sailed maybe 15 or so boat under 19 ft and can't remember any of them having a topping lilt. But Heh..... if you think it would help... go for it... just remember, if your mainsail has a all full length battens or a large roach (that's the "hump" on the leech) then it will be more annoying than beneficial.