Pit Bull Potty Training Advice?

So I have had my Pit Bull for about a year. He's around 2 now, but he keeps peeing and pooping in his crate when we leave. We've been working on potty training for a while now, but nothing seems to work. He's also started doing it on our rugs too, but we take him out at least every hour or two. Is there anything else that I should try?