A tire store should be able to help , perhaps better than anyone here at the forums , they will also need the load rating ( E or G ) or the load capacity ,
3,000 pounds at 90 psi , for example, from your current tires, and the installed height . You should also check the rims your considering purchasing, to make sure the maximum inflation allowed is equal to the tires your considering, that info should be stamped into the rim , near the valve stem.
Also some of the older 16.5" Dodge wheels used a special lug nut , with a different taper angle than the older 16"wheels and the newer rims went to a flanged lug nut, that may not fit your wheel studs, so very important to get all the info you can before shelling out $$$.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.