I have K5LA’s and I going to put them on a 2009 F250. My questions are:
Im going to install my horns where my spare tire is… My question is why does everyone point there horns to the front of the truck when they install then in the back of the truck. I would like to face mine to the rear pointed down slightly, will this be ok?
What is the biggest tank that I can install on my frame rail?
What size air line do I need?
Yes u can point them any which way…or switch horn on the manifold and have em point both ways…
Prolly 8gallon maybe…
1/2 inch airline minimum
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welcome. facing them to the rear helps keep debris from getting inside.
Mine are faced forward because that’s the way I look when I drive 
Depends on the tank you buy. Get the measurements of what you can fit, then shop for a tank with less than that diameter. i.e. not all 5 gallon tanks have the same dimensions.
do an online search for skinny air tanks.
Or pancake
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