Help!!!! Travel Trailer Back in

We've been camping for 10 years. First, a 28' trailer, then, 36' fifth wheel, now 39' fifth wheel. Backed into so many sites, left, right, sun, at night, off cambers, off level, trees, in the rain, in the rain at night, brick retaining walls, drop offs, short sites, knocked down posts, removed posts, vehicles parked on the road. Once with a bow hunter that used our site as a parking spot. Squeezed in next to him about 4" away. Good guy though, had a good laugh when he returned. Pretty much everything. Some of these older campgrounds weren't designed for a 39' rig with long bed dually. Point is, even after 10 years, it is still hit or miss. Sometimes I get in on one shot, sometimes many more. At the storage unit, I often unhook the fifth wheel, and re-position the truck. I do a lot of Get Out and Look. Even then, I rarely get exactly where I want to be. Oh Well!