1969 Chateau--Exterior Paint--Nice Weather

We have great weather and it is predicted for a few days, so I am putting off finishing the floor to paint the exterior of the trailer. I have done LOTS of research. Our first trailer we used spray paint--it looks great and has held up well--but it took a lot more than the "$50 paint job" on you-tube! I wanted to try something else--I ended up using Sher-Cryl from Sherwin Williams. It is $120 a gallon--expensive, but I feel it will be the best option. (Really the best is using automotive paint and spraying it on and then a clear coat--but then you are looking and LOTS of moolah!) I am going to roll and brush--because I am doing it in my drive-way and don't want over-spray on the house--not to mention the neighbors house (the guy at SW said the over-spray can travel 1/2 mile). Here goes. Oh, and I went with an Extreme High Bond Primer. So much work to scrub!