https://www.amazon.com/dp/B08PDRTX5X/ref=cm_sw_r_cp_apa_glt_fabc_SHZJF61CH1A6J0X2VK61

https://www.bsaelectronics.com/collections/dryer-buddy-plus-auto

May wanna look into a proper split if you're dedicated on doing it this way .

I am not an electrician. This is my best efforts response.

Your juicebox uses a NEMA 14-50R outlet and your dryer is probably a 30 amp NEMA 10-30R outlet. You can buy an adapter.

You can also buy a switcher so you don't have to unplug your dryer and plug in your juicebox every time you want to charge. Disclaimer: I have not used this so I am not recommending it! But take a look at https://www.amazon.com/Splitvolt-Splitter-Automatic-Switching-Between/dp/B08PDRTX5X?th=1 Specifically the 2nd option that splits to one 10-30R and one 14-50R

The only other thing I would check is the amperage on your circuit breaker for your dryer. If it is a 30 Amp breaker then you need to go into your juicebox app and lower the max charge current to 24 Amps. This is because a continuous electrical load must be limited to 80% of the max the circuit can handle for safety (heat leading to fire) reasons.

Yeah, I heard that too, I guess the plugs weren’t Designed to be unplugged then plugged back in again. I ended up buying this converter and it works great, Splitvolt NEMA 10-30/14-50 Splitter Switch 10-30 Plug to 10-30 Outlet (A) & 14-50 Outlet (B) - Automatic Power Switching for Dryer and EV, Internal Safety Breaker, Real-time Display, 24 Amp, 240V EVSE https://www.amazon.com/dp/B08PDRTX5X/ref=cm_sw_r_cp_api_glt_fabc_76YW5DRC06DRE1SFWCT1