Regarding tyre balancing, there is another option which would be good for the heavier vehicles. Weights have a habit of getting knocked off if going off road. While I was out working on a customer's GMC CCKW last year, he had the local truck tyre specialist out to inject a special product like minute beads in to the tube. Once the wheel starts rotating the beads automatically balance it out. As the tyre wears the balancing continues to correct, whereas weights are only good for a certain period.
Going back to weights, when we had the Bedford MK in service, it was found that at a certain speed, there would be a lot of steering shake due to imbalance of tyres. We had a large 3-phase electric motor with a roller on, front wheels jacked up, with the drive flange removed from the hub replaced by a dummy one. The roller was used against the tyre to power it up to speed and an optical instrument, which I cannot remeber details of now, was used to view the tyre, similar to a timing light if memory is correct. This not only balanced the tyre and wheel, but also the hub and brake drum. Lead weights were used on the rim.
Richard