To the OP, I wonder if your battery was fully charged when you left.
Plugging in at home for 24 hours should do it but maybe not.
Read our FAQ here
Why is my new battery dead?
Check your battery with a digital meter. Turn off most everything and
check voltage at the battery.
12.75 volts with no load (nothing on, not charging) is pretty close to 100% full.
12.00 volts with no load is pretty close to 50% charge and you want to
try to always stay above 50% for longest battery life.
IF you want to find your phantom loads you can do that.
My meter has a amps scale.
It can test milliamps but has one scale that's 2 amps I believe.
Start with your highest amp scale and pull fuses at your fuse box
one at a time.
Place the meter leads across the empty fuse holder.
The meter takes the place of the fuse and reads any current that's passing
in that circuit. You can quickly find circuits that are drawing off your
battery this way. Take notes so you get a total.
Some trailers might have the LP detector on it's own inline fuse and not
actually go thru the fuse box.
You should be able to go 2 days easy, if you're careful. You need to
be sure you're starting with a FULL charge
and you need to use a meter
to find everything that's drawing off your battery.
Hope you get to the bottom of your problem.