Understanding Solar

Okay, will target those with 5th wheels and using solar to help with off Grid camping. I have looked at the Renogy Portable suit case and that is a 100 watt system. I was thinking of getting 200 watts and was wondering how that would work for us. I don't know how much of a solar system is needed to be able to run one AC unit, or maybe you can't run an AC unit at all.? Or just normal electrical stuff in your RV. I Don't want to spend a couple Grand to get just a little help with solar, and just to let you know, we would have a 5.5KW LP Generator. I just don't want to run the Generator as much, if I can use my Solar. Please explain as simple as you can on what type of solar system to get. I don't want to just jump into some big solar panels to mount on top of the 5er, and spend that kind of money. That is why I am saying I would like to take small steps and try it out with a 100 or 200watt Renogy Portable suit case to help us out on Charging up our Batteries and or 5er. I understand very little of what it does for energy and using electrical stuff in the RV.
Also I heard you should get solar batteries instead of regular Deep cycle batteries??? Do most 5ers come with 1 or 2 Batteries. Do you think it is a good idea to get an extra battery if you have the space. Not to sure what space I will have when getting the Generator put in. Again this is a 2016 5th Wheel we are going to get. Thank you for any Info on this topic and I do hope someone out there will be able to help me understand solar a little better than I do now. I soon to be, Happy Camper and Boondocker... Mark and Jodi...