Great all around
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 3850RLX 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, 2019.
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
RVMattress.comCopperFlex Essential
- All-foam
- 6 in thick
- five comfort options
$799RV King - 72x80 · list priceSee price
Firm
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
Cooling
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
Heavy duty
RVMattress.comTitan Plus Luxe
- Hybrid
- 13 in thick
- Plush
$1,865RV King - 72x80 · list priceSee price
Helix 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
RV hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King 72x80 · list priceSee price
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 72 × 80 inGet a quote
The Cardinal bedroom. Measure the platform, not the old mattress, before you buy.
The 3850RLX floorplan
Forest River's 2019 3850RLX floorplan.
Is this your 3850RLX?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2018 | Cardinal Luxury 3850RLX | – | – |
| 2019 | Cardinal Luxury 3850RLX | 39' 6" | – |
Sources
- recreationalvehicles.info: https://recreationalvehicles.info/2018-forest-river-cardinal-luxury/
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20190622231721/https://forestriverinc.com/rvs/fifth-wheels/cardinal-luxury/3850RLX/4032
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20190624180212/http://www.forestriverinc.com:80/ImageHandler.ashx?ImageID=79100
Questions
What size mattress is in the Forest River Cardinal 3850RLX?
The main bed is 72 × 80 in (Forest River spec sheet, 2019).