When towing, the trailer very much needs to be level. The ball height is set by that criterion. Tow the trailer to a level parking lot and measure the distance from the asphalt to the bottom of the trailer frame at the rear of the trailer and the tongue. The measurements should be the same.
If it needs to be higher to get out of your driveway, airbags are the best solution to that. It will get very old very quickly having to fully hitch up with one draw bar to tow out of the driveway, then fully unhitch to swap out to a different, lower, draw bar for towing.
Good luck, and let us know what works.
