I agree with Larry Cad. We started with a small popup and DH and I took it to a school parking lot. We had 4 cones that i borrowed from our local police department. We set them up, drove around them, between them,etc. going forward. THEN, we started backing into place. We laughed, we yelled, we giggled, but we finally got it. It was not a quick process.
We finally settled on me backing the camper and DH out spotting for me.
It has worked for over 30 years with us backing in that way. Both of us can do it, but I am a bit more proficient. We have had 6 different campers in that length of time from the popup, hybrid, bunkhouse TT, 2 5ers and now with have a diesel pusher.