It seems like the right side of my truck has been a bit rough. Are my bearings screwed?

 

jack your wheel up until its of teh ground. Grab the tire from the top and from the bottom. shake it back and forth and if you have alot of play when you wiggle it around or if u hear clicking or metal to metal noises yes probably.

 

that or you need to rebuild your calipers

 

could be your shoes too. I had that on my mazda after every brake job, if it got a lil wet around there, then id have these lines of dust, they were actual lines of dust, driven out by cintrifical force. but never had any issues....

 

take off the hub cap and take a pic, i think its just brake dust but who knows.

 

It is most likely brake dust, I just had my brakes redone.