1. The trailers are raw aluminum without a finish on them so it will always be a dull grey. You could polish it and finish it.2. Yes it it typical around welds. Metal, when welded, "Pulls" in. So, anywhere there is a weld on a flat surface you'll sell a slight dip.
3. I wouldn't worry about it right now. But it is an easy fix with a fiberglass reinforced body filler like Dyna-glass.
4. Its your boat and if it bugs you try to fix it. New graphis cost about $200. If you buy new graphics have a detail shop (one the does pin stripping) put them on for you.
5. If you are EVER in doubt of bearings replace them and repack. They are cheap.
2006 21' Xpress X-21 LE - Evinrude 225HO - 12" Hydraulic
http://www.machlink.com/~jr225ho/