Midland...since most people at a dock and plugged into a charger don't have Trojans and don't have any way of measureing the specific gravity of their batteries...the general recommendation is for EQ once every 6 months. In cruising situations batteries are often not fully charged daily so the EQ recommendation goes up...
...Since you are quite a bit more rigorous tha most in both your selection of batteries and your charging routine, you can avoid the EQ routine until something appears amiss.
I did say I personally don't think an equalisation charge is of any merit except perhaps if the batteries have been consistently under charged...
So actually no disagreement there
So if one consistently undercharges then equalisation may help, but it will not undo all the damage from undercharging - consistent undercharging is a road to hell for the batteries, due to sulphation, equalisation practiced or not.
Also, and often not stated, equalisation is just extremely inconvenient for most of us as for the 8-12 hours of the equalisation charge until one is sure that the cell SG's have stabilised one has to keep all consumers not rated at the equalisation voltage (normally all on board) off the batteries meaning a long period of sitting on a dead ship - assuming, of course, one is not prepared to just leave the boat to itself during the process
So, in my view, the best approach is to learn to look after the batteries instead, and that is something that is very easy to do, even when cruising for long periods well away from shore power and a very easy task of no effort at all if in a marina - just have to make it a habit.
Am not sure of why the inference that cheaper batteries than Trojans require routine equalisation. Personally, considering the build of cheaper batteries, I would have thought routine equalisation would be less useful for cheaper batteries, if it were to be required for any.
I would suggest that being able to measure SG is of little importance in taking ordinary good care of the batteries. As the case is though I do have a very good hydrometer - useful, obviously, if something goes wrong before the end of the expected reasonable life of the batteries but fortunately I can't speak from experience there and it has never been used