I connect a hose between the filter and the RV's fill port/city water so the filter rests on the ground. This prevents it from torquing/breaking the plastic connectors.
I use the same filter. I put the pressure regulator on it, the only hook it to the water spigot, the out to the TT. We usually only camp on the weekends from March thru November. I make sure to dry it out as best I can before putting it away and 1 filter will usually last that amount of time with us. I did use two last year, the CG we were at had an issue with the water system and plugged up the filter with sand.