[eZAK]

This is my fourth trailer in 20yrs.
My annual axle / suspension maintenance is;
1) Drop and remove the spare wheel
2) Jack up the rear curb side axle and remove wheel
3) Check; Brakes, Hub, suspension, air pressure. perform maintenance where necessary
4) Install [spare] wheel then move on to the front curb side.

From the front curb side to front street side to rear street side to Spare carrier.

I think it is pretty straight forward and simple.