Re: 3 Trailers 5 Bearing Buddies and 1 &^$^%R*&^!!!
I've used BB for about 30 years and never had a failure, ever, though the covers can be a PIA. I also make sure there is spring pressure, which doesn't seem to be the case here, since that's what makes it work. Regular caps are fine if you want (or fell you need) to repack yearly, or more often.
I can count on one hand the number of times in those 30 years I've felt the need to repack (3 diff trailers, fresh and salt). I'll pull the BB at least once during the season to check on emulsification in the hub, and replace seals when they start to seep, but that's about it. Product reliability has been good up to now, don't know what the future holds with everything being chop-suey ...