I just did pulled pork in my crock pot.

They didn't have pork butt, only tenderloin at the store, which isn't fatty at all and what I read on the webs mostly says that it's not doable and the meat turns out really dry.

BUT. I cut the tenderloins into thirds, seasoned with salt & pepper, onion & garlic powders, and paprika and seared them on all sides in a skillet.

I also chopped up about 1/2 lb of bacon and pan fried it up and dumped it all into the pot to maybe add some fattiness back into the meat. I also poked holes in the tenderloin after I seared it so that the liquid & fat could get down in there while cooking.

In the crock pot, I poured in some Apple cider vinegar, beer, low sodium chicken stock, Worcestershire, sliced onion, and a bit of brown sugar. Not much of each.. Don't wanna entirely cover the tenderloin. Throw the pork in there, cover, let cook on low for about 6 hours until it's falling apart. Take the meat out, shred it with a couple of forks, then add the meat back into the juice in the pot to keep it moist.

I have a smaller crock pot though so my tenderloin pieces were stacked.

I bought some fresh baked onion Kaiser rolls from the store, made a homemade Cole slaw with Apple & a tiny bit of blue cheese, a homemade BBQ sauce, and made bbq sammiches! With mustard & dill pickles on top... yummmm