When it comes to mattresses, I would never buy one unless I could actually lay down on it first. We purchase only from real stores (not on-line), and we sample them before we purchase. Looks are highly deceiving if you never try it out first.
With that said, we purchased new mattresses for our previous camper, same as we had in the house. We have Serta's in the house, so it was only fitting we get a Serta for the camper. We kept the original mattress and put it under the bed in our guest room. When we sold that camper, we pulled the Serta out and put the original back in. We are still using that same Serta mattress in the guest room now. Our current camper (Outback), was purchased with a pretty good mattress already. We were prepared to switch them, but the one in the camper was so good, we just left it and kept the Serta in the guest room. That bed now has 2 mattresses on it (makes a very high bed, but also very comfortable for a guest room).
So in my opinion, (really....) if you purchase off the internet something that is advertising "RV" on it, you'll probably end up with another uncomfortable mattress and end up going to a real store after all, and you've just wasted your money.
If you can actually try out one in your link, you may like it after all. But but purchase blind? Don't be surprise if you end up with what you've already got!
My suggestion, get the same kind of mattress you use in your house, and get it from a real box store. By the way... our Serta's are great! We have 2 queens, and 1 king, and even purchased a baby crib mattress from the same store for our grandson that lives with us.
