Duel axle trailer should back just the same as a single axle. NONE of them will pivot on a single point as it's impossible but they ALL will drag the axles through the turn (one reason trailer tires take such a beating). There IS no replacement for practice. You'll NEVER be a competent backer if you have to "remember" little tricks to do it. Backing should be as second nature as going forward and you don't need any tricks to remember how to do that. Find that empty lot and learn the skill again.
For what it's worth, every time I watch someone struggling to back into a site almost UNIVERSALLY it begins by not pulling far enough PAST the site they're trying to get into, thus making it necessary to turn too sharp.
Good luck / Skip