First impression that does not sound like a good idea. Even given the fact that you have a small trailer.
If you are setting the gain for the trailer at the module on the trailer you have no way to modulate the trailer brake application power once set. Most brake controllers have some means of modulating the trailer brakes either through a pendulum, program, or mechanical system. In the absence of a modulating system you only have ONE brake setting. If that is set for slow speed you will have little or no brakes at high speed. If it is set for high speed you will most likely lock the brakes at slow speed.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles