I have the US Off-Road metal bumper on the front but otherwise stock front and rear. Didn't think about the filler cap. I will check the clearance. I was also thinking of hiding it in the grill because I can fabricate a mount behind the grill pretty easy. But as you say, it has to be visible...
I have the All-Pro Apex with kick-outs and plate covers. DOM tubing, I have used the hi-lift to jack from them and they are extremely sturdy. Saved my quarterpanels too many times.
I have my dual ARB compressor in the engine bay, but am wanting to route the chuck to the exterior so I don't have to open the hood ever time I want to air up. I was thinking of using the antenna hole that is the Passenger cowl, or making a hole in the cowl on the drivers side behind my ditch...