I put the filter at the spigot. I figure that if I'm filtering the water to keep stuff out of my TT piping, I want to keep it out of the hose as well. I connect the pressure regulator to the TT city water inlet.
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Rod and Pam
2018 Jay Flight SLX8 212QB
2018 Durango GT V6
2013 GMC Sierra SLE 5.3
Husky Centerline TS
This is the reason I put at camper. Extra port to hand wash, and less likely for it to grow feet and walk away. I also have a sewer solution dump system. Just much more convenient for me. I use a hose rated at about 115 psi from post to tt. I'd rather lose just a hose and not my set up.
PaulB12
On the TT side. Too many spigots are located low and the end would drag on ground. I use quality quick connections and plumbers tape on each connection. Zero leaks.
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2017 JayFlight 21QB
2021 Ford F150 SCrew 3.5 Eco, 157”, 3.55, Tow Pkg
I put mine at the trailer. I figure that no matter how well I take care of my hoses something may get into them. By putting it at the TT I assure that anything entering the inlet has been filtered.
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2019 Chevy express 2500 Van Coversion. 2017 Jayco 23MRB: 26' total and Glacier Package. 2 Renogy solar panels. Married 49 years. Haley the mutt, 4 years old. "Excited to learn new things everyday and humbled by those who offer to help." And very grateful to our Moderators!