Wow, difficult question. I've been up and down that route numerous times but darned if I can remember any specific station that accommodated my 36' Class A pulling a car. All I remember was that it wasn't a problem. I'd stop for the night, get online and plan my next travel move and as part of that, I'd google 'diesel fuel near whatever-town-I'd-stay-at-next'. Then with addresses of the stations that looked promising, I'd google earth them and choose the easiest in/out stations. Works every time. You can also just google map the address and zoom down using street view. And 'satellite' view is handy too.
In summation...it's not a worry finding big enough stations on that route if you check out your destination points prior to travel. Google Maps to find them, Gas Buddy to check out prices around the area where I'd need the fill up. Have fun!