No that is not Normal
Bottom does start going out first and then top should follow------smoothly
BUT top should not be sticking/binding
Slides need to be adjusted (probably down a bit)
New trailer.......??
Dealer for warranty work OR possibly an authorized mobile repair (if FR OKs) You pay for serve call/FR pays for work performed
Only thing that should be used is talcum powder on seals (in a sock then rub them down) OR a 303 protectant
Hydraulic ??
rack should be wire brushed to clean----manuals do not call for lube
I use a dry graphite spray on lube (goes on wet/immediately dries---doesn't attract dirt/grim) Use it on stabilizers also