If memory on the 2000s at Ladder 85 is correct...
If I recall correctly the issues with 85 were that their 2002 Seagrave 95' was a lemon. They were constantly in a spare as that truck kept having frame issues (believe it was cracked frame). Rig was finally taken out of front line and put to CTS and then somehow found its way back to front line service as a long term spare at ladder 12. Sometime in 2005 while these issues were ongoing and ladder 85 was constantly in a 1994 75' spare they were reassigned Ladder 84's 2003 75' when Ladder 84 was converted to a Rearmount receiving a 2001 Seagrave 100' rearmount ex BOT as their front line truck. For 84 this made sense as there was no Rearmount on the south shore; 82 was the only one prior to this. For ladder 85 this did not make sense as the monster truck doesn't seem so monstrous when it is a 75'
Ladder 85 was temporarily assigned a 2013/2014 75' before they got their 2014 95' that they have today.