[ecomodded]

Great improvement you made with with your mileage and by the sounds of it you'll be increasing it even more, 60mpg or better might be in your future.
That little trailer from the other thread would work well with your car. Reported to weigh 400lbs ? sounds suspiciously light, but who knows..
Welcome to the site,
ps the Vortex generators may or may not work to lower fuel economy. Personally I think they 'could' improve the aerodynamic characteristics of some cars, just not sure which ones and where to place the VG's.

They are used to aid down force by directing the air onto a rear spoiler, placing them to lower drag will be tricky, Tricky is not impossible just difficult..