I searched this thread for an answer to this exact Question that was posted back in ~2021 and see there is no response so thought i would ask the question again of the J30 owners.
I ask because in both of our van builds my wife and i use the Froli Sleep System below custom cut natural latex mattresses (one is 3" the other is 4"... the 3" is ideal IMO).
We are in research mode to purchase a 2024 JLU + J30 top and think the Froli + a ~3" would be awesome in the bed area. Just wondering if anyone is doing the same.
Cheers,
Thom
On the topic of natural latex for mattress insert...
We have the 3" (nominal) mattress covers from Ursa Minor (the set of covers we received, ordering from Ursa are actually 3.5" tall when measured exactly). We had a local upholstery foam company cut foam to perfectly fit the covers (this was when we realized the covers we received were actually 3.5" thick - from the foam factory's sizing/fitting their foam to exactly fit the empty covers we brought to them). We slept on those foam cushions for a 7 week extended trip this spring, but felt there was still room for improvement.
We recently purchased both a 2" thick "firm" and a 2"-thick "medium firm" natural latex "mattress topper" sheet of latex foam from SleepOnLatex (from Amazon). The latex is more compressible (or squishier) than the standard foam, and the medium firm material is significantly softer than the firm layer. I just finished cutting both layers down to fit the 4 Ursa mattress cushion covers, and now have the 2" Firm mattress layer in the bottom portion of the cushion cover, beneath the 2" (softer) Medium-Firm layer, inside the cushion covers - i.e. two/dual layers of latex in the cushion covers. This 4" of latex (as two sheets, each of 2" thickness) fits the zipped up covers from Ursa shockingly well height-thickness-wise; but the proof will be after sleeping on it several nights in the Ursa. (Ref: AISN for Amz lookup: B00UYG9WBS for firm; and B00UYG95T2 for medium-firm)
The latex-as-cushion (instead of traditional foam) is both noticeably heavier/denser than the classic upholstery foam mattress, and quite a bit "floppier" when handling or maneuvering the zipped-up cushions
My experience with home-bed mattresses has been that natural latex is much more pleasant to sleep on, than memory foam or traditional mattress-foam - i'm excited to see how the full-thickness latex performs inside the Ursa's bed-cushion covers (will test out for sleeping on a short trip next week - but so far, so good, after an initial/brief driveway-nap).
We aren't using Froli, but we do also have a layer of this thin/breathable/cushioning mesh material from Sailrite under our mattresses in the Ursa:
DetailsMoisture Prevention Underliner 60" x 90" is an innovative high-strength mesh material designed to promote consistent airflow underneath your mattress, minimizing the chances of condensation, mold and mildew growth.When a mattress or cushion is located in a place such as a boat cabin, RV...
www.sailrite.com