Marine grease will work fine, you don't need much. Some spring shackle bolt's have grease zerks in them from the get go. Just make sure that all pivot points move free and don't forget the bearing buddy's. Hope it settles down for you, the idea of the trailer is the convience for you, load her back up motor, battery, and fishing gear, so all you have to do is back it in the water and go fishing. If you need more weight add lead ballast to the rear of the trailer, a small loaf pan filled with lead weigh's about 35lbs a couple of these should help settle it down