Will a 2" memory foam topper fit behind couch?

We roll ours up and drop it in behind the the couch back.  We roll up our sheet and very light weight comforter with it.

I like the strap idea, I can see where that would make it easier to move the topper around.  We also store our pillows behind the seat back with the topper.  I can confirm that it does block the heat and will require putting some vents in the top of the rear shelf.  

We have a 2" foam mattress in a duvet cover that we roll up and put behind the seats.  Fits along with bedding and 4 pillows with no problem, although the roll is a bit awkward, so I will look for straps as suggested by others.

We tried everything to make the original cushions more comfortable for sleeping and sitting. Nothing worked very well and they all created bulky storage problems. While we were at Tearstock last month we replaced all of our cushions with the more dense foam they are now using. The difference is like night and day. Sorry to say it was not cheap $600 that also included new fabric but we would do it again in a minute. For bedding we use a Travasack ( know longer made). Since the cushions are only 4" thick a one size smaller fitted bottom sheet works pretty well. We sewed the top sheet across the foot section. I am sorry if I hijacked this thread from the OP. I hate it when that happens.

We have a 3" memory foam mattress topper also. We roll it up using 3" wide straps which clip with plastic snap together buckles (I made). The key is wide straps as the narrower they are they tend to cut into the foam. My boys who are 10 & 11easily roll, unroll, buckle, unbuckle and lift over the folded sofa back. There are about six travel pillows and two king sized flat sheets stored behind the sofa back also with room to spare. King sized quilt will fit back there too. To make storage easier we cut two pieces of 1/4" underlayment and just laid them on the bench framework behind the sofa. The mattress doesn't fall into the far underneath storage area, making it much easier to put back and remove. It will survive an alde failure kept high and dry. I bought a king sized topper and trimmed to fit. We set up the bed and return to dinette status daily because there are 4 of us. It only takes a few minutes. We left home July 26th and are due for a September return so we are adapting well. So much to see in the American west and a good night's sleep helps us get the most out of our day. Hope this book length post helps.

We use a 2" foam topper that we cut in half and use 2 twin size duvets to cover them.  It's easier with the 2 pieces.  We are going to add straps like others have suggested.  I'm interested in the thermarest idea because I tend to get warm.  Too bad I gave mine away to my kids for tent camping!

We have a max S.  I bought a 2" foam California King-sized topper from Kohls,  Sealy or Serta brand, as I remember.  About $60 with Kohls coupons.  I only had to trim one side.  It was surprisingly easy to cut with my Pampered Chef kitchen shears. 

Can someone post a picture of the storage process. We have a 2" topper and I can't even begin to think of how I'd get it behind the rear seat. We end up leaving the rear seat down all the time and pushing the topper & other bedding against the back wall. I'd love to hide it all away.

Our topper is in a duvet which serves as the bottom sheet.  To store, we remove the top sheet and blanket (and I anticipate the comforter when it gets cold) and fold them separately. Then we roll and drop the topper, the same as lapowers57.  

Based on comments above, I found some luggage straps and have used them on the roll which makes the roll less awkward and easier to drop behind seat back.  If the process still isn't clear, I will try to take some photos and post.

Mine does not get dirty when I drop in behind the seat back because my trailer is still fairly new.  What it does do is make it harder to utilize the space for storage as it makes it harder to get things in and out.  I plan to look at a mod to install a grate or screen over the opening so that the topper can not fall to the bottom.

We had a 2 inch foam topper that we couldn't roll up tightly enough to fit behind the seat, at least not without a lot of effort.  We replaced it with the 1inch "Pure Green 100% Natural Latex Mattress Topper" from Amazon.  It's soft, the cushions beneath it are firm, we're happy.  We ordered the queen size, which is only a few inches narrower than the bed, and we trimmed off about 4" from the bottom to eliminate overhang.  I stitched together two sheets to make a "pillowcase" for it, which serves as our bottom sheet.  Then we use a duvet for the top sheet/comforter.  It rolls up into a neat little log to toss behind the seat during the day, then comes together easily at bedtime.