I agree with the 'portal to them' where they're tamed, I have and that base just becomes, "HogFarm" on my map; whenever I need fresh boar meat, I just portal in and hang out for a day or so....do some crop tending and raspberry collecting to pass the time.

Moving boars around is a frustrating and time consuming experience, the wolves are much easier and the Lox the best as you simply jump on and just drive them to the desired location.