If you want to back up with the dingy hooked up, y'gotta make sure the dingy is backing up STRAIGHT....any variation and the steering wheels will almost immediately turn (in either direction) and lockup. Not good.
I have been unable, sometimes to back up even 5 feet without the dingy steering wheel turning. Other time...I was able to back up almost the length of the motorhome (34 ft) and everything stayed straight.
As far as gas stations are concerned...I always have to make a snap decision just before I turn into one. Question...and ONLY question is "do I have an "escape route" to get outta there?
That question..,.I found out when my motorhome was brand new. In Florida...pulled into for gas at one of these places where the pumps are opposite the the store. NO room to turn left or right. Had to unhook the toad, wife backed it up almost to the street...I had to back up the motorhome...then we hooked it back up. Only did that once. I learned fast.
As far as campgrounds go...mostly you unhook before you back into your site...if you have a back-in site. Otherwise, with a pull-thru,you don't have to bother. However...once I pulled into a campground and they TOLD me to unhook right there in front of the office. I did. They knew their campground...