I also had a Chevy 6.0 gas truck that would get around 17 on the road.
It would pull a load as fast as the Powerstroke but with a load the 17 mpg would go to 6 to 8mpg.
And I asked this earlier and was wondering since of lot of you have Haulmarks.
When they are left outside do you put a cover over them or what do you do to protect them from the weather?

I think if you tried to cover it up you're asking for some moisture damage, but at the same time you're going to get some U/V damage to it if you don't. We've got an older Haulmark car trailer that's red. It sat out for the first 4 or 5 years that we had it. By the 3rd or 4th year, the fiberglass cap on the front had turned extremely milky and faded, like what Gary is describing. It never really bothered the sides to where a good buffing wouldn't bring the color right back, but that cap had to be re-painted. Friends had a black on that did the identical thing, so it was the material, not the color.
The other thing that happened was it had some seam sealer on the top that had to be re-applied about every other year. It would flake up and start to look like chit. It was sort of a nasty process to have to scrape the old off and put new on every once in awhile.
What's the construction of the thing? With the v-nose, if it is all the vertical panels like are on the sides, it might fair pretty well outside. If not, I'd just let it go and deal with the consequences later. Pretty trailers are nice and look good behind big trucks, but sitting outside isn't going to affect the way it protects the bikes you'll haul inside, and that's the part that counts.