How are you guys faring on the balance situation? What are you doing to get them to ride well?
I use the chart at imiproducts.com/equal/quantitychart
Equal is a commercial powder used to balance tires internally. Dynabeads is another commercial product doing the same thing.
I've had great success with all of my trucks and cars using internal balance. For inexpensive bulk material I use the miniature Nylon pellets found at the arts and craft store (Think Beanie babies)
37x12.5-16.5 says 6-8 oz. per tire.
Automatically re-balances each time you start and stop.
Works to balance the entire assembly and will road force balance a cupped tire to make it tolerable.
(Yes this is a glorified version of the old BB's / Golf balls method)