During my web searches for suitable Vanagon tires, I came across the
following tires:

Cooper Discoverer LT LT195/75R14 "C" M+S 1435lb load max 50psi

Mastercraft Courser Radial LT (same specs as above appears identical)

Mastercraft Courser R/D
185R14 "C" 1875 lbs @ 65psi
195R14 "C" 1875 lbs @ 65psi

Avon Supervan AV4 185/75R14 "C" load index 102/100 Speed P (93mph)

Avon CR25 WinterVan 185R14 "C" Reinforced 102/100 load index (This is a
good winter tire) speed N (87mph)

Full specs of the above tires can be found at:
http://www.roadmastertire.com/