Thank you

New to my 1st build as well, I got to thinking, with a deep fryer, grill, broiler and hot water heater, will I actually need all of these to have their own regulator or is there a regulator capable of handling all of this or is each piece of equipment a need of its own based on manufacturer design?

I have a 1998 P 30 old Mac tool truck with a factory installed under carriage propane tank but am not sure what size it is, its pretty big though.

The standard supply line gas pressure is 10″-11″ WC.  You only need additional regulators for appliances that use a lower operating pressure. These low-pressure regulators are usually supplied with the appliance but could be missing if you purchased used appliances.    … You need to review the manual for each piece; total BTUs required by all appliance which will be running at the same time; then size the the LP tank(s).