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
Forest River Cardinal 378LF 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 →Forest River spec sheet, 2020.
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 Cardinal bedroom. Measure the platform, not the old mattress, before you buy.
The 378LF floorplan
Forest River's 2020 378LF floorplan.
Is this your 378LF?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2018 | Cardinal Explorer 378LF | – | – |
| 2020 | Cardinal Explorer 378LF | 41' 2" | – |
Other Cardinal mattress sizes
Sources
- recreationalvehicles.info: https://recreationalvehicles.info/2018-forest-river-cardinal-explorer/
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20190916022523/https://forestriverinc.com/rvs/fifth-wheels/cardinal-explorer/378LF/4021
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20190916163143/https://forestriverinc.com/ImageHandler.ashx?ImageID=79073
Questions
What size mattress is in the Forest River Cardinal 378LF?
The main bed is 72 × 80 in (Forest River spec sheet, 2020).