I found 10 carrier boards from other makers that support Jetson AGX Xavier and have at least 2 CAN ports. They come from Connect Tech, Auvidea, Realtimes, Forecr, PLink-AI and ID Solution. I left out the other two Diamond Systems matches, Elton / ELT-BB01 and ELT-BB02.
For reference, your STEVIE / STV-BB01 has 2 CAN ports, a –40 to 85 °C operating range and a 9–20 V input. diamondsys...diamondsystems.com ↗“Diamond Systems STEVIE / STV-BB01”
AGX Xavier carrier boards with 2 or more CAN ports realtimesa... +9realtimesai.com ↗“Realtimes RTSO-1001 carrier board”idsolution.ru ↗“two CAN buses”realtimesai.com ↗“Supports AGX Xavier and AGX Orin families”plink-ai.com ↗“2x CAN, 2x RS232; -40~85C”forecr.io ↗“Military/aerospace-grade carrier board for Jetson AGX Xavier/Orin”connecttech.com ↗“Connect Tech Rogue-X2 (AGX108)”auvidea.eu ↗“Auvidea carrier board for Jetson AGX Xavier”connecttech.com ↗“Connect Tech Rogue (AGX101”connecttech.com ↗“Connect Tech Rogue-X (AGX103)”auvidea.eu ↗“Carrier board for NVIDIA Jetson AGX Xavier modules”
| Maker | Board | CAN ports | Supported Jetson families | Operating temp | Power input |
|---|---|---|---|---|---|
| Connect Tech | Rogue (AGX101 / AGX111) | 2 | AGX Xavier | –40 to 85 °C | 9–19 V |
| Connect Tech | Rogue-X (AGX103) | 2 | AGX Xavier | –40 to 85 °C | 9–19 V |
| Connect Tech | Rogue-X2 (AGX108) | 2 | AGX Xavier | –40 to 85 °C | 9–19 V |
| Auvidea | X221 | 2 | AGX Xavier, AGX Xavier Industrial | –25 to 80 °C | 12–48 V |
| Auvidea | X221D | 2 | AGX Xavier | Not listed | 12 V |
| Realtimes | RTSO-1001 | 2 | AGX Xavier, AGX Xavier Industrial | –40 to 85 °C | 9–20 V |
| Realtimes | RTSO-1002 | 2 | AGX Xavier, AGX Xavier Industrial, AGX Orin, AGX Orin Industrial | –20 to 85 °C | 9–20 V |
| Forecr | MILBOARD-AGX | 2 | AGX Xavier, AGX Xavier Industrial, AGX Orin, AGX Orin Industrial | –40 to 85 °C | 12–30 V |
| PLink-AI | Y-C8 | 2 | AGX Xavier, AGX Orin | –40 to 85 °C | 12 V |
| ID Solution | IDS-AiS-AGX | 2 | AGX Xavier, AGX Orin | –40 to 80 °C* | 7–17 V |
*For the IDS-AiS-AGX, the maker says the operating range depends on the SKU or module. idsolution...idsolution.ru ↗“rated -40 to +80 C depending on the module”
May also qualify: HZHY-AI701, Y-C9 and Y-C13 are also AGX Xavier carrier boards, but no CAN port count is listed for them, so I can't confirm they meet the 2-port requirement.