Top pick
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$1,865RV King - 72x80 · list priceSee price
Jayco Seismic 3512 mattress size
Main bed72 × 80 inRV king
That's an RV king, 4 in narrower than a regular king (76 × 80 in). A regular king won't fit, so get an RV king in exactly 72 × 80 in.
About the RV king size →Jayco floorplan drawing, 2025.
Mattresses in 72 × 80 in
We may earn a commission when you buy through some of these links. It doesn't change which mattresses we list.
Best value
Mattress InsiderThe Sedona
- All-foam
- 5.5 in thick
- Firm
$40372" x 80" · list priceSee price
Reviewers' favorite
RVMattress.comAurora Luxe Cooling
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress for Temperature Regulation Read review
$2,465RV King - 72x80 · list priceSee price
Best memory foam
Mattress InsiderElation Gel Foam
- Memory foam
- 6 in thick
- cushion firm
$65972" x 80" · list priceSee price
Best hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King 72x80 · list priceSee price
Best all-foam
RVMattress.comPlank Firm
- All-foam
- 10 in thick
- Firm / Extra Firm
Mattress Clarity: Best RV Mattress for Heavy People Read review
$1,532RV King - 72x80 · list priceSee price
Reviewer pick
HelixHelix Midnight
- Hybrid
- 11.5 in thick
- Medium Feel
Sleep Foundation: Best Mattress for Side Sleepers Read review
$1,489RV King · list priceSee price
Reviewer pick
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
$84972" x 80" · list priceSee price
The Seismic bedroom. Measure the platform, not the old mattress, before you buy.
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2022 | 60 × 80 in Queen | – | – | Jayco spec sheet |
| 2023 | 72 × 80 in King | – | – | Jayco floorplan drawing |
| 2024 | 72 × 80 in King | – | – | Jayco floorplan drawing |
| 2025 | 72 × 80 in King | – | – | Jayco floorplan drawing |
Years not listed weren't published.
The 3512 floorplan
Jayco's 2025 3512 floorplan.
Is this your 3512?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2020 | Seismic 3512 | 40' 4" | 7 |
| 2021 | Seismic Luxury Series 3512 | 41' 10" | 6-7 |
| 2022 | Seismic Luxury Series 3512 | 41' 10" | 7 |
| 2023 | Seismic Luxury Series 3512 | 41' 10" | 7 |
| 2024 | Seismic Luxury Series 3512 | 41' 10" | 7 |
| 2025 | Seismic Luxury Series 3512 | 41' 7" | 7 |
Other Seismic mattress sizes
Sources
- Jayco (jayco.com): https://www.jayco.com/uploads/rvs/brochures/Jayco%20Seismic%20Single%20Sheet%20Flyer.pdf
- Jayco (jayco.com), archived copy: https://web.archive.org/web/20210920090619/https://www.jayco.com/rvs/toy-haulers/2021-seismic/3512/
- Jayco (jayco.com): https://www.jayco.com/rvs/toy-haulers/2023-seismic-luxury-series/3512/
- Jayco (jayco.com): https://www.jayco.com/rvs/toy-haulers/2024-seismic-luxury-series/3512/
- Jayco (jayco.com): https://www.jayco.com/rvs/toy-haulers/2025-seismic-luxury-series/3512/
- Jayco (jayco.com), archived copy: https://web.archive.org/web/20210918174540/https://www.jayco.com/rvs/toy-haulers/2020-seismic/3512/
- Jayco (jayco.com), archived copy: https://web.archive.org/web/20211204074011/https://www.jayco.com/rvs/toy-haulers/2022-seismic-luxury-series/3512/
Questions
What size mattress is in the Jayco Seismic 3512?
The main bed is 72 × 80 in (Jayco floorplan drawing, 2025).