With my 45 foot coach 200 gallon tank and long toad, I use the truck lanes. I try to avoid rush hour fill ups. Weekends are the slowest time to fuel up; evenings are good too. So far, I've avoided any congested truck stops and have blocked no one.
While I have two fuel filler necks on my coach (one on each side) I only use one at a time because I only have one tank. I read in the manual that using both sides could risk fuel coming out of one of the sides. Seems unlikely to me, but I guess it depends on the design. Doesn't matter, I just clean my windshield like everyone else while I'm waiting for the tanks to fill. They have extra long wooden handles at the truck lanes.
In any event, I find that filling up at the truck stop when it isn't crowded is a much more pleasant experience than navigating the RV lane or using the slow pumps at the car island. As Mr. Mark said, there is usually a $75 - $100 limit on the regular pumps so you have to go in anyway or swipe multiple times.
My DEF tank is also on the wrong side of the coach so I've had to use refillable jugs to take advantage of DEF at the pump. I recently bought a 5 gallon jug to make the job quicker.
I always pull forward after filling up even if there's no one behind me just in case someone needs the pump. So far, I've encountered no obviously rude drivers. If they hate me, they sure do a good job of keeping that to themselves. Actually, some seem rather friendly, so I wouldn't worry about that. Just treat everyone with respect and you shouldn't have any problems.