we have three eva dry small dehumidifiers for the winter time.
they use very little power, less than an amp but will flat pull the water from your air.
we have two small ones (pint) and one large (qt)
i installed the big max air covers over all of our vents. this really helps with the temp differences and in turn will reduce the condensation on the vents.
make sure you have good airflow around the rig to keep the condensation down on the windows and metal surfaces.