Whether or not you are happy with the 'Dealership' in general, should not stop you from getting warranty work done on your new truck. The service shop, and especially the techs don't want you to be coming in every second day pissed off about your truck, so are likely going to make every reasonable effort to ensure it's done right. Purely from a business financial perspective, there is no money in repeating the same warranty repair, so might as well do it right the first time.
From the technician perspective, most techs I've met are not
doing this for a living because there were no other available career options. Most are doing this because they have some sort of passion for working on vehicles, and as a result, most have a fair bit of 'pride' in what they do. Giving them the opportunity and respect they deserve goes a long way to developing a relationship that WILL benefit you in the long run....and from personal experience, the occasional box of donuts helps in cultivating a good relationship. The fastest way to technical perfection, appears to be through the stomach.....who'da thunk!