Most angled sites are easier to back into than a straight site. When it's angled, as you reach the spur, turn your vehicle away from the spur as you go past. This will put your RV in an angled position on the road, but that angle will be close to the spur angle letting you almost back in straight.
Someone else mentioned it earlier, but do a search on "The Scoop" backing up method. This will give you greater maneuverability in tight spaces.
When I first got my TT, I was worried about backing up. I hadn't towed for a couple decades. Because I had to back it up into a tight driveway (brick house on one side, 6ft fence on the other and only about 10ft wide. I started out by parking it on the street when I got home, and then early the next morning I would go out and back it in while there was no one on the roads. Much less stressful while I was trying to get the hang of it (and I didn't have helpful strangers trying to direct me making it more stressful and difficult). After a few times, I got comfortable enough that I could back up anywhere and anytime. When I got the C, it was a piece of cake in comparison.