Personally, i use AGM's.
They can be depleted lower than 50% and recover.
They seems to charge faster while under tow as well as using the genny.
Whatever 2 batteries you plan to use, make sure they both fit in the battery tray on the trailer.
A lot of trays will only fit 2 grp 24 batteries. Measure them including the plastic battery box you plan to place them in.
Especially when you add your personal items inside the trailer, which can add to the hitch weight (tongue weight)
be careful adding tongue weight to not exceed the rating of your WD hitch as well as the rear tires of your 150.
EX : my dry listed tongue weight is about 475# ...my real weight can be around 900# . (that's with one grp 27 battery and a tongue bike rack installed).
