Hey everybody

I have been so busy I have only had time to read here lately, but haven't posted. I just logged in to get some advice because I know you guys are the ones who know everything lol
Pixel is due for his next round of shots (after 1 year) and I've read NOT to give them rabies and lepto together. Is this correct? My vet didn't seem to think it would be a problem. If it is, which one should I hold off on and for how long do I need to wait? Thanks for any help!