- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
That's an RV king, 6 in narrower than a regular king (76 × 80 in). A regular king won't fit, so get an RV king in exactly 70 × 80 in.
About the RV king size →KZ spec sheet, 2020.
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Sleep Foundation: Best Mattress Overall Read review
Sleep Foundation: Best Mattress for Temperature Regulation Read review
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.

The Venom bedroom. Measure the platform, not the old mattress, before you buy.
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2016 | 60 × 80 in Queen | – | – | KZ spec sheet |
| 2017 | 60 × 80 in Queen | 40 × 96 in | – | KZ spec sheet |
| 2018 | 60 × 80 in Queen | 40 × 96 in | – | KZ spec sheet |
| 2019 | 72 × 80 in King | – | – | KZ spec sheet |
| 2020 | 70 × 80 in King | – | – | KZ spec sheet |
Years not listed weren't published.

KZ's 2020 V3411TK floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2016 | Venom V3411TK | 37' 8" | – |
| 2017 | Venom V3411TK | 37' 8" | – |
| 2018 | Venom V3411TK | 37' 8" | – |
| 2019 | Venom V-Series V3411TK | 38' 9" | – |
| 2020 | Venom V-Series V3411TK | 38' 10" | 8 |
The main bed is 70 × 80 in (KZ spec sheet, 2020).
40 × 96 in (KZ spec sheet, 2018).