After a bit of looking I have found a German company that manufactures quality tires and offers many sizes and tread patterns suitable for our vintage bikes.
The company is Heidenau. Somewhat new to the US but not so new to other parts of the world.
While they don't have a 3.25x16 for the Dream they do offer a 3.50x16. (I think the Dream looks good with a slightly wider tire anyway) I have some tires already on order and will verify actual size but according to the distributor they should be very close to that size.

These are $68 each plus $10 shipping.
If you are looking for stock size tires for the Superhawk they have the 3.00x18 in the same tread pattern as above. $67 each plus $10 shipping.
The front 2.75x18 has the below tread pattern.

Price on this one is $62 each plus $10 to ship.
Many other sizes also available to fit other vintage bikes.
These tires have appropriate speed and load ratings for motorcycles. These are not moped tires.
For more info and pricing on other tires check it out here.
http://www.scramblercycle.com/heidenau-tires.html
Thanks,
Kevin