Do they make a "T" for the dually valve stems so you can fill both of them at one time? Is this a good thing?

 

Oh yea, lots of semi trucks have them. Should be able to pick up the lil kit for it at any truck stop where they service tires.

But as for it being a GOOD thing or not.. thats entirely up to you. If you ever go offroading, I wouldnt have them incase a stick or rock rips it out from between the duals, then you got two flats on one corner..

 

I looked today at Flying J and Pilot and they didn't have them? I don't go off road so I should be ok

 

the TA truck stops have them but they don't work on the low pressure that our tires operate on..... i'd love to make a pair for my truck.....