Home speakers with car receiver possible?

Hello everyone, I recently purchased a new to me but used tent trailer. I realize were coming to the end of the season but I wanted to get a bit of a Headstart for next year! We like to have a little bit of music when we’re camping. I have purchased a set of 4 ohm marine speakers (JVC CS-DR621MWL) that I will be installing into the side of the tent trailer facing outward to the ‘patio area’. I also purchased a JVC car receiver. I would like to have some music inside the trailer, for mornings, evenings and even rainy days. I have been thinking about perhaps installing a set of Polk Atrium 4 speakers. These however indicate 8ohm resistance. I think the JVC car receiver (KE-X840BTS) would prefer lower ohms? 
What can I do?

Looking for ‘sound’ advice. I’m already ‘guessing’ about adding some sort of resistor but unsure if that is the proper method or even how to do it. No ‘guessing’ please!!!