I am trying to do is pick out a service panel. MY requirements are. Meter on the Left, 4 jaw Ring, no bypass, outdoor, surface mount, 200 amp, Main Breaker, 8 breaker spaces Underground feed and Lower Right Side knockout. What are the requirement I should be looking for in a unit. Is breaker type just preference or is one better then the other. Is Bolt on better for outside use, versus Plug on. I will install a 100amp breaker and feed to an RV panel on same board. It has it's own breakers for 50/30/20amp plugs. Thank you in advance
It’s up to you whether to get a combo meter-main-panel it get them as separates. I prefer a separate meter from panel, so You can change the panel without having the PoCo come out and remove the service drop (and all the permits and inspections they will require for that).
A “farm panel” is a popular product that contains 8 breaker spaces and thru-lugs for carrying the full 200A onward to another panel. That seems to meet your requirements.
I'd use an all-in-one pedestal unit
As it turns out, you can get everything you need (200A 4-jaw ringstyle meter socket, support for underground service), 50/30/20A RV receptacles, and room for an onwards feed or branch breaker spaces) in a single piece of hardware: the Midwest Electric M275CP6010. While it doesn't stake a claim to having an EUSERC standard pull section, it shouldn't pose too much trouble for your utility, and has 4 spaces left over that can be used to feed other things. (If you wanted to feed a panel, you could rearrange things and use a Midwest CB2200B or GE THLK2200 in the freed-up slots; for smaller panels or branch circuits, you can just use a THQL as a feeder breaker instead.)