Nervous First Time RV Buyer Looking For Tips & Advice

Thanks for all of the advice. So we found what we want. Coachmen Freedom Express 233rbs. Has 2 slide. Anyone know anything about these? Good solid camper? Looks like we are getting it for 19k out the door including electronic brake, weight distribution hitch, tax, title, etc. is their anything we should see if we can get them to throw in?

Also some of these have a black tank flush other don't. If ours doesn't, is this a big deal?

Thanks