Thanks for all the replies. I'm beginning to think the panel won't be worth setting out unless it's a sunny day.
I typically dry camp for 3 or 4 days at a time and haven't had any issues since I've switched over to the 6 volt golf cart batteries. I haven't been using my furnace since it really seems to drain the batteries.
I didn't think my old trolling battery was fully charged, but I'll try running a load off of it to see if the charging amps increases. I keep hoping to have the sun break through the clouds to see the panel function in full sun.