A list of options would have been of great help to me when I was buying my Georgetown 300 last year. My experience was limited to setting up a tent, and of course you don't get straight answers from most sales folks if the option is not on the unit they are selling! Not knowing what most of these things really did made it an east decision to think I didn't need it.
I bought entry level not knowing if would use/need all the bells and whistles, and I'm still learning. I bought my rig mainly for boondocking but wanted to be comfortable in an RV park also. It came without an inverter, surge protector, automatic transfer switch, artic pac, or compartment lights. I have since added all but the artic pac..... plus a solar system and automatic generator start capability.
All of this adds up to a lot of money as you know! When dealing on a new rig, all of these add-ons are a good negotiating tool once a deal is close. For example, my MH did not have levelers either, but the dealer added them on for $1,000 bucks, much less than I would have paid later.
My point is, if you don't have prior experience RVing, most of this stuff is "greek" without an explanation. That's where this forum could help with a list of options and recommendations based on group knowledge!!!