Couldn't help but laugh when I read your topic, "The Salesman told me..." Generally speaking, the answer is the opposite of what he said. But it makes for a fun read. I don't know the answer to your question - not in my job description. I can give you info on ways to store things, ways to make it look like it's personally yours, I can even help with grey tank and black tank questions, and to never, never ask what is the best brand of tire to buy. But others will have the answer to your question.
Being a newbie in itself is a tough enough job without some salesman trying to feed you stuff. We've all been there and lived through it, oftentimes thanks to these forums. Just so you'll know it's coming, please post your tow vehicle and specs, the part of the country you live in so if traveling over mountains is a part of the deal, how many in your family and anything else you think might be helpful. You'll get a lot of good, accurate into and whatever else you need to make a wise decision. Good luck. And don't forget what I told you about those tires...go back and do a search on previous posts, but don't open up that can of worms if you can avoid it, lol.