I use 2 75ah yasusu battery's, they are 3 yrs and still going strong.
I rotate them , one or other is always on charge, use 1 for a day , put on charge , put other battery that was on charge in van.
Used this way saves either battery getting a hammering ,
Use a good quality intelligent charger and they will last ages.
My first battery only lasted 1 yr , constantly deep cycling, plus using a cheap battery charger , meant it did not last very long
Daz