While I suggested the tongue jack, that may be the only thing you should do right now. Take your camper out a few times and you'll see what may or may not work for you. I've seen mods I would like to do and I've also seen some mods I would NEVER do. Just because a mod works for someone doesn't mean it will work for you.
For example, some people will replace their bulbs with LED lights. This is fine if you are camping without electricity but if you always plan to camp with electricity then it's really not needed.
For now, enjoy your new camper but also browse the forums to see what people have done. You'll eventually see what you may want to do.
2013 Jayco Jay Flight 26RLS - 2013 1500 Ram Big Horn
2013 Jayco White Hawk 28DSBH - 2010 V8 Tundra
2012 Jayco X17Z SOLD!:Beerchug: