So while I am waiting for Rickson Wheels to let me know when they will have a better estimate for the 17.5" wheels to be available... and then I will need to put money down.... I have been researching heavy load range tires that will fit the stock E-450 Class C rims.
It turns out there are more options available with a 120 / 121R Load Range for the 225/75R16 size than I thought were available.
Several people on here have already mentioned the
Nexen Roadian CT8
https://www.discountedwheelwarehouse...&partno=15386N
Here are some other tires worth considering....
1)
Continental Vancontact A/S (this is not the VancoFourSeason, which is also an option) https://www.tirerack.com/tires/tires...!g!99873031453!
2)
General Grabber HD https://www.tirerack.com/tires/tires...!g!99872886733!
3)
Federal Ecovan ER02 225/75R16 121/120R F (12 Ply) https://www.prioritytire.com/federal...l-season-tire/
4)
Nokian WR C3 https://www.discounttirezone.com/NOK...xoC8hgQAvD_BwE
5)
Michelin Agilis CrossClimate https://www.walmart.com/ip/Michelin-...RoCRRYQAvD_BwE
6)
Hercules Terra Trac CH4 https://simpletire.com/hercules-lt22...BoCCakQAvD_BwE
I may consider the Continental, General or Michelin if I decide the cost of the 17.5" custom rims is just too expensive and still be able to use a tire that is rated for over 3000lbs.