Connect Sink Directly to Portable Wastewater Tank

Hi, I'm working out some basic plumbing for a 6x12 cargo trailer --> camper conversion. My only inside water will be for a sink so I wondered if I could connect the sink drain directly to a portable wastewater tank (https://www.etrailer.com/RV-Sewer/Tote-N-Stor/TNS25951.html) with a short RV sewer hose (https://www.etrailer.com/RV-Sewer/Viper/D04-0402.html.) The tank opening looks like it's made to fit one end of the sewer hose, but I'm not sure about connecting the other end to the bottom of the sink, where I have a 1 1/4" threaded strainer. Anyone tried something like this? The tank will be directly below the sink.

Thanks for any guidance you can provide.

Mark