what size wheel and tire does your trailer have?
you might be able to go to a slightly taller tire - also, is there any adjustment left on your spring hangers?
You can add a correct track equalizer setup and those will give you some additional height on the 5er side.
i know with mine, i went from 225/75R15 tires on 15" wheels up to a LT215/85R16 on 16" wheel and this gained me a full inch of lift on the trailer side - i also was able to more to a lower spring hanger hole and that gained me another inch of height. I took it one step further and bought 2" mounting blocks to replace the factory 3.5" blocks on the back of my F350 - all of this together gives me a nice and level setup.