Hey, and no worries about starting too many threads here. Unless Jingles says otherwise, I say keep them coming! That's great that your installs are going well too. If the trailer you're talking about is the type of mobile stage I think it is, you might have to source in some heavier duty lights for that application. Don't get me wrong - ADJ gear is great and all, but it's designed and built to suit a specific market. The Megapixel, DOTZ, Flat Par Series, etc. are intended to be used in applications for bars, clubs, DJs, and small to medium-sized stages. Once you get on a larger stage and/or lose control of your ambient light, the performance of these fixtures drops off very quickly. Keep in mind that for outdoor applications, you can't control the sun, moon, streetlights, carnival lights, and such. You also need to take into account the weather and the fact that these light may be exposed to moisture, so an IP65 or similar rating is a must. It all depends on what you're looking for and what your customer has in mind, but I think you'll need fixtures with much higher output than what you've been using thus far.
When I light similar sized outdoor stages, I usually put up 16-32 250w PAR 38s, 8-12 500w PAR 64s, and any effect lighting that the customer requests (movers, strobes, etc.). I don't use LED in my rigs because I personally feel it looks too cold and dark on the performers, plus to get fixtures with reasonable output I'd be spending in the $500 to $800+ range per unit. I have a hard time justifying the expense of a few dozen of those when the halogen fits the needs of my customers at a fraction of the cost. What kind of power capacity does your stage have? LED is obviously superior when it comes to power consumption, but if you're on a tight budget the units you'll be able to afford will look very dim (and thus cheap) on a large stage. Most large stages have the power supply to match it, so you can often work around that.
I guess to bring my rant back on topic, I'd suggest testing out the Megapixel you have on the stage (if possible) and see how it looks. If it's too dim, you'll have to decide if you want to spend the big cash for higher output LED units or go for the cheaper but power hungry halogen fixtures. Your choice, and the nice thing about lighting is that there's more than one right way to do something! Hope this helps!