Welcome to irv2.com! I'll offer my opinion,
Unless your trailer is sitting in a twist(you unhitched while your rig was in a tight turn situation) both sides should be within 1/4" of each other. Park your trailer on level concrete with both tow vehicle and trailer in a straight line, crawl under and measure the distance from the front axle U-bolt to the corresponding U-bolt on the rear axle(both sides). That is the measurement that's important. If there is over 1/4" difference between sides, at least one axle is out of alignment.
P.S. It helps a lot to know the brand, model, year of your trailer.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"