I just put on new MT's at just under $500 each and they are not 19.5!!
IMHO the M 55 is still worth it. I ran them on my 05 CTD dually. Awesome in any weather, any terrain. (They were also siped). Currently saving up for a set to replace the Maxis ST on my TT.
Second to NONE!!
'17 Class C 22' Conquest on Ford E 450 with V 10. 4000 Onan, Quad 6 volt AGMs, 515 watts solar.
'12 Northstar Liberty on a '16 Super Duty 6.2. Twin 6 volt AGMs with 300 watts solar.