pismo beach sand with wd bars and airbags. few questions.

1) Yes you need the bars even with the bags. Your hitch probably states that as well, certain weight up to # without WD and above that you need WD. Deflate the air bags unhooked, use a measuring tape to measure the top of front bumper and rear bumper to ground. Now hook up, use WD bars and measure again, adjust air bags so you're level and should be the same measurments as without the trailer or equal for front/rear bumper.