2 more questions (Hatch seal & keel)

1. Hatch seal, when I close mine there is about a 1/4" gap between the hatch and the companionway and the hatch really doesn't go over the companionway at all (even to it). A nice rubber flap would be great to keep the rain and mosquitoes out. Ideas?

2. Is there any chance that when a keel boat is on the trailer it just might push the bottom of the boat up a tad--even as small as a 1/8"? I ask because the porta-potti that is stored under the step which is right over the keel and is totally impossible to get out. I got it out once by almost having to use a winch but then played around with it and found out of I leave the lid off (1/8" lid roughly), it fits OK....still a tad sticky but one hard pull and it's out. I then got thinking of possibly the keel is pushing up just a tad and that will go away when launched. Am I nuts in thinking this? If I am nuts then I will tell my wife she will have to go to the bathroom in a skillet because that will fit in the area with ease.