Welcome Nathan! Nice boat that V18, I'm sure that will provide a lot of hours of quality family boating and fishing time for you. Covers... hmm, there are a few places worth checking where you can get a custom-fit cover for a Targa V-18 w/ or w/o a Trolling motor. Aurora Covers is real good for Sunbrella covers, but pricey like the BPS ones, and Bald Mikes who deals in Carver covers which is a cheaper price point but decent covers ranging from 7oz up to 11oz material.
I've had the Nitro cover from BPS and not the best value. Aurora covers is much better for that kind of money, and Bald Mikes is a good option for a Sun-dura or Sunbrella. Right now I'm using a Sun-dura custom-fit and no problems at all and I trailer it everywhere. I'm sure there will be a few more good recommendations too from the others.
Again, welcome!