It is common practice in the industry but common practice and good practice is far from the same thing…
THIS IS NOT GOOD PRACTICE, OR IMHO EVEN ACCEPTIBLE PRACTICE for RV trailers that are at or neat full load their entire useful life… and should be a warning to keep close tabs on you individual wheel weights….
It’s amazing how industry sells these half-baked ideas as acceptable and prudent when they are anything but…
Using this common practice will almost guarantee there are overloaded situations while the trailer is doing anything but sitting on level ground…
Equalizers minimize loading one axle more than the other but doesn’t eliminate the problem, and there are no side to side equalizers…
Many if not most RV trailers loaded close to their GVWR are overloaded on at least one wheel…