I always get a kick of people worried about blowing themselves up charging the battery. Please remember the battery doesn't produce hydrogen gas unless you're equalizing. Even a 400 amp hour battery only produces one half cubic foot per minute gas.
Most folks have a very small solar panel < 200 watts and the very small battery < 200 Amp hours.
A 15 Amp charge controller is gonna have a hard time - to blow yourself up with that.
Not to say its impossible if you hook the battery up to 100 amp charger
while sitting inside smoking a cigar & your trailer is covered with a plastic bag
But mostly since equalization only takes 2-4 hours , every 1-3 months....
if you just open the doors & windows ....
99.99% of the you should be ok IMHO