That all sound great,ya those extenders are not the way to go,I would go with longer valve stems.
The best on the market,that are the original,are
Tire Man.
Chuck is the original designer of these an he has been around for years. If you have any questions just give him a call, he is always happy to help. Any others are just cheap reproductions of the original.
The kit looks like
This it is for all 6 wheels,they also come with flow-thru valve caps so you don't even need to take then off to check the pressure.
Here is a list of all the products he sells.
Have a safe trip home.