Personally, I'd go for a neutral stock color. I hate black for an interior color, 'cause it looks like you got wasted on miller lite one night and pulled out your 2 extra cans of Krylon still in the WalMart bag and started sprayin', and the 12 empty cans are still in the bed!(You asked for opinions!)
I also don't care for the red idea as it would be distracting visually while driving, for me. But hey, if your just trailering it from show to show, who cares? If it's tastefully done, anything goes. grin