I would consider Trojan T-1275 to be one of the best available. They cost about $250.
With that said, I have used WM 29DC and 27DC batteries, made by Johnson Controls, in my boat and camper for years without issue. They last 5-6 years when properly maintained, not over charged or discharged. I have read the WM reviews but have to question if they are protecting their battery from abuse and neglect.
My camper is plugged in year round. The convertor in the camper I have now (WFCO) outputs a constant 13.6V, too high for a continuous, long term float charge. To address this, I put a timer on the battery + post when not camping to charge the battery one hour every three days so not to overcharge and boil out the battery. I generally water and equalize charge them every six months.
I understand it can get frustrating here sometimes. A simple question can get indirect answers or answered with questions. They are just trying to help.