If your park model has a regulator already attached, (some do that accepts 20 or 30 # tanks) then all you need to do is supply the cylinder(s) and screw on the pigtail(s) to the tank(s). No tools required.
If your park model only came with a capped off supply line, then you will need whatever fittings necessary to attach the regulator to the supply line and whatever pigtail(s) necessary to attach the tank(s) to the regulator.
Not every park model (or R/V) is the same. We really don't know what you have or don't have.
Welcome to the forum! I see it is your 1st post.
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