larger Tires & hitch for '99 Astro cargo van?

[thing]

need tire information and the reasonable amount pricing for a hitch light load (class I, i belive), OEM or other.

[drew300]

tires: I go to www.tirerack.com for a lot of tire info. I put a class 3 hitch on my van. I can tow bigger stuff if need be, and it also adds a bit of weight (45 lbs or so) to the rear, for winter help. It bolted on.
GM already has the trailer wires in place. I found the wires, with the correct color codes, jammed up inside the passenger side pillar, about window height.

[thing]

Cargo Van '99. thanks!! i have recently self installed a class III hidden hitch #89011 from etrailers.com. it make the ride less floaty and was almost fun. i will check out the tire site tho i think i will replace tires w/ the factory specs. Thx for the wiring tip.