What do you think you're missing? The price is what it is, the only negotiation will be the mounting, balancing and maybe a credit for the carcass (although if aged out then probably nothing). I only had our front balanced.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition