New R/V mattress

Pretty much anything you buy will be far better than what they call a mattress that comes in the RV. We've put memory foam mattresses in our last two RVs. First was from bed in a box, before they got really proud of their products. The most recent was from Walmart online. If you are really particular, it may be worth purchasing from a local mattress store where you can see the display models. I've just relied on the online reviews and ordered ones with good reviews. We've ordered them for the house and RV over the years.

A couple of things to look out for from experience:

• Measure your existing mattress. You may or may not want to alter the size of the replacement, but don't assume all queen or king mattresses are "standard". They aren't. There are "RV" (short), California (Long), and completely odd ball sizes. When we ordered our first replacement, we assumed it was an RV queen. When we got it, it was about 4" shorter than the existing mattress. Our current trailer came with an RV queen, but I measured before we ordered and decided I had room to modify the platform and replace with a regular queen. Custom sizes can be ordered but may be more expensive.
• If you have under bed storage with gas struts to hold it up, they probably won't hold the weight of a memory foam. Not a huge problem for most, but something to be aware of. For now I use a 1x2 cut to length to hold it up, but stronger replacement struts are available.
• Thicker isn't always better. We ordered a 12" thick mattress for our latest. It's very comfortable, but while 4" difference in height doesn't sound like much, it is.
• Weight difference. Memory foam is going to be significantly heavier than what comes in the RV. The memory foam is probably somewhere in the 60-100 lb range for a queen mattress.

Wow, on edit, just realized this thread is 2 months old. In normal times, I would assume the OP has already made a decision but with everything going on, maybe not. Either way hopefully this will be of use for someone...