Sorry two.fiveM35, it's been some time, but for info purposes, I think I missed the first part of your question. We have I think it's Wager Latex airless sprayer, it has it's own pump motor(looks like a small vacuum cleaner), no thinning required! Stir, pour into the cup, and have at it! It is perfect for this kind of paint!
Sorry I missed your question, hope your trailer worked out!
And, so far the Behr is holding great, only issues are where the Canvas Ropes tie, the paint pulls off a bit, but VERY cheap and easy to touch up!