OMG after much research, yes I often research things "to death"........I opted to purchase the 13" Brentwood Home mattress from Amazon and I can't say enough GOOD things about this purchase.
Other than the box being pretty beat up upon delivery, the mattress was in perfect condition and we were able to get it into the RV with no problems. Removing the original mattress required a little more effort but we got it out. It will be donated to a charity.
It was amazing how quickly the new mattress "popped out". I was afraid that 13" might be too high, but it was not. We have had WONDERFUL nights sleep with this new mattress no pressure points no aches and pains upon waking up.
It was a great buy for the price as I was not willing to spend thousands on a mattress, never have, never will.
Susan