No loads with a battery disconnect right off the battery on all of the past 7 rigs I've owned over the years. The typical 12v FLA are junk IMO. Well not my opinion really when they have proven to be so with multiple rigs and multiple brands of them.99% of trailers with electric brakes only have a mini sla battery that just charges off the 7 pin including those with a power tongue jack. Not travel trailers but just everyday flat or enclosed trailers. If your chassis battery isn't lasting more than a couple weeks you have something else connected to it draining the load. It's not an issue with FLA it's an issue with whatever is pulling a load when off