Dominance Have one boar, adding two more?

I had a trio of boars - two bothers who I had since they were 4 weeks old, then I got given an-wanted baby boy when my guys were 1 year old. My two older boys had already been de-sexed and intro's were super easy. In the end after some hassle I just got the little boy de-sexed, no problems since then at all. None.

There is a lady who just'g gotten in contact with me - she has two 3 year old males *brothers* and their father who is 4 years old, they've just started fighting, but after talking to her...it's due to mites *her vet said because they'd been treated for mites a couple of months ago it couldn't be..sigh*. So her boys got along great for 3 years, not de-sexed.

It's possible - just bonding the right boys together.

Yes I agree with @RodentCuddles as long as you do the introductions right everything should work. You might have some squabbles here and there because the two 3 week old boars will go through adolescent age at the same time, other than that you should be fine.

Would a 2x5 with a 2x3 Loft be sufficient in space? They'd be stacked in an L shape