This is Jim, I'm confused!  Please give me yes or no answers to these 
specific questions.

Can I put 205/70's on my diesel?  Some say sure, some say expect disaster.
I'm confused...yes or no.

Can I use a high load rated tire instead of a "reinforced" tire?

Will it handle okay if I do this?

Does the "s" in 185/75 sr 14 mean sidewall reinforcement.  I don't think 
it does but I've been told it does and it doesn't...I'm confused...a guy 
at a tire store said it stands for standard.

I've got four different kinds of tires on my van right now, a 185 xzx, a 
continental "reinforced" something or other, and two no name crap tires.  
One "good tire is on the back left and the other is no the front right.  
My van drives like s**t.  Help me buy 4 tires that I can run out and put 
on this week.  Name the  brand you like.

Thanks
Jim Miller 
83 diesel Vanagon "radhaus"