fldoc

I just purchased an used lund 1800 explorer. I will use the boat mostly for inland fishing but would like to mount two downriggers on the gunwales to fish lake superior. It has a SportTrak gunwales. Lund has a SportTrak downrigger mount. I was reading a few posts and got the impression one must be careful to make sure the gunwales will handle the stress created by downriggers. Will they be strong enough to handle downriggers with an 7/8 pound ball? Or should I look into something different?