This is an early photo of my setup. I now have 3 pumps with PTFE line (the rear in this photo is long gone as well.) My pre-filter is mounted on the trailer hitch, but before the hitch was installed it was mounted on the rear bumper.
Personally, I prefer my setup to others that I've seen (I guess that's why I have it haha), but the downfall is that there is not room to run the exhaust over the rear axle.
My secondary filter is attached to the Jegs fitting that is visible in the photo. The piece of steel they hang on I welded onto the frame just behind the springs. If I can find a better picture of the 3 pump mounting, then I'll attach it. But I'm quite certain it is in my build thread in the Drag Racing section. It should be updated since Feb. with the current setup.
View attachment 224249
Edit : found the pics, post 735.
If you're running external(s), then get the primary pump as low as possible, trust me, it's important.