Newmar, because of the heavy construction has had front axle loading problems for years. In '98-'99 they had to upgrade a number of rigs to 275/80 tires. Don't remember the weights on our 2000 DSDP, but our 2002 DSDP only had 663# of CCC BEFORE we ever loaded a thing or got onboard.
Newmar did have Spartan install a 14,600# axle, but it was derated to 13,200 by the 275/70 tires. I have since replaced the front tires with 305/70's and new Alcoa wheels that are wider than the OEM.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey