I am planning on mounting a 8Hp. Merc. on my 17.5 foot Starcraft (fiberglass). Main power is a 110hp. Evinrude. Planning on using a retractable alum. mount thru-bolted on the stbd. side of the transom. After reading some recent posts, I am concerned about the stabilty of these mounts. Will it help to put a stiffner plate(wood/metal)on the inside of the transom to help spread the load? I fish salt & fresh water(nearshore) and plan on using this kicker for slow trolling and a backup in case the 110 takes a powder. Also looking for some advice on mount location,how to measure , how close to main engine etc. 