I wouldn't worry about adding anything to the front. The only reason you would want to add the Coil SumoSprings item # CSS-1125 to the front of your 2018 Crosstrek is if you had a front hitch or weight pushing down directly on your front axle.
Since you're close to the towing capacity on your Subaru, I recommend using a weight distribution system to address the sagging in you're experiencing. The Fastway e2 Weight Distribution w/ 2-Point Sway Control item # FA92-00-0450 works with trailer's... view full answer...
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