the good thing is on a single overnight, if you find you are really missing something you will only be without if for 1 night / day.
the bad news is that if you plan wrong for weather / etc. you could be a little cold / wet / miserable.
but its only 50 miles, and its only 1 night.
so, think about getting out of your comfort zone and carry a truly small load.
certainly be safe, and pack for the weather - but if the goal is to test out light loads for simple overnights... you can get away with pretty sparse kit.

here's my rig setup for a winter overnight.
the basic kit can be extended to multiple day / week trips.
i just add more calories / clothes, etc.

IMG_4177 by mbeganyi, on Flickr

of course, this setup is designed for moving, rather than hanging out in camp. although we've done that too - with a big fire, extra food, etc.

yard sale by mbeganyi, on Flickr

Krampus in its Element by mbeganyi, on Flickr

your large rear panniers should be sufficient... unless you are winter camping or planning on carrying heavy gear / food / booze / etc.