For what it's worth, I've been using a (prior to me owning it) well used G5400 for the past year with end mounted M2 Leo-Pack yagis..... with no problems at all.

My rotator is low enough that "mid mounting" the array (on a fiberglass boom) is not possible, and counterweighting would likely involve a large weight due to the lack of moment arm length available off the back of the array.

If/when it fails, I'll be sure to report my findings to this group.

--Roy K3RLD