There were also few unpopular Quads in service in the 1950s when tillers were assigned to all other ladder companies.
The concern about apparatus floor weight bearing capability must be an engineering challenge. How do you evaluate and then continue to evaluate floors for if weight is a valid safety concern. Do you just reinforce every apparatus floor? Most FDNY firehouses are 100 years old, or nearing that age, to include all the Walker firehouses. Many were built for smaller and lighter horse-pulled rigs - both engine and truck. Can you accurately project future years' structural wear and tear on floors? Will firehouses need apparatus ratings for weight bearing and size limitations which will affect apparatus assignment and relocations?