Berocia SUV Air Mattress, Thickened Car Bed Inflatable Home Air Mattress Portable Camping Outdoor Mattress, Flocking Surface, Fast Inflation https://www.amazon.com/dp/B075ZYT2N5/ref=cm_sw_r_u_apa_glt_fabc_Q9MJC02AQDG1ZW7NJKJ8?_encoding=UTF8&psc=1
This one I believe is the one someone mentioned and said fit perfectly.
Someone posted a mattress on this sub once that they said fits perfectly in the back of a fit. Let me see if I can find a link, I think I saved it on my Amazon list.
Also, definitely scroll through this sub, there's been a lot of posts about successful fit camping.
Edit: Here's the link:
https://www.amazon.com/dp/B075ZYT2N5/ref=cm_sw_r_cp_apa_i_uMlNFbH05XRYP?_encoding=UTF8&psc=1
6'2" and have camped sleeping in my 21 big bend a bunch. I bought this after having one with a bigger "pillow" in it because I actually prefer sleeping with my head in back, feet toward the front, this way if you close the trunk you can still extend your legs fully. This with some blankets and pillows is all I've needed for me and my gf to sleep in it comfy. Also a nice setting in the car you can turn on/off is the idle auto shut off. So if you need heat or ac to get to sleep you can have that going for about 30-45min just idling and then the car will shut itself off, or if you want it running the whole time, you can have it so it never shuts off.
Hey! No platform, I live in Brooklyn and unfortunately have no place to store one in my apartment. As far as mattress, I got this one and upon checking reviews someone said "if you have a Honda Fit, get this bed" so I took a chance and honestly it seems like its laser cut to the Fit haha. I love it. It blows up in sections which is super helpful. Only thing to note is that the top section lays a bit awkward cause the center console supports the middle but with the seats up front folded and pushed up theres nothing to support underneath the left and right sides of the mattress. my fix was to just put some stuff we brought (backpacks, etc.) under those parts for support.
I bought this SUV air-mattress along with a little USB rechargeable pump (the one it comes with is too bulky for me), and it fits really well, as long as I can completely empty the cargo area. I try to fit everything else I'm carrying into either my attic net or two totes that I use to fill the space between the folded back seats and front seats. (Most people recommend action packers for this, but these totes are both significantly cheaper and larger, and fit in the same space)