A great place to find used tractors in Northwest Indiana is on the website zimmertractor.com. You should be able to find many tractors from your area.
Travelling from Washington DC to Indiana you would travel northwest.
What make of tractor? The best place to look would be in the box with the tractor when you bought it.
Novanet: The Northwest Ordinance of 1787.
The best place to sell a tractor would be Craigslist.com That website can have many people view the tractor, Its most likely someone would buy the tractor, and you would get many offers.
The best place to find a John Deere Model A tractor would be on the official John Deere site. Their site would give one information on where a tractor can be purchased.
A tractor would sink because the pressure is high and all the weight is in a small place. with a large surface area it is harder to sink
The Tractor Supply Company (TSC) likely will carry the parts you require to repair your tractor. I would contact them. You may also be able to place an order online.
The places to purchase Case Garden tractor parts are many and varied. The best place to start would be Amazon. If you are on a tight budget, a good option would be eBay.
I would not recommend it, stick with the straight 30W.
A tractor supply company is a great place to start. You can also look on websites such as Ebay or Craiglist for a listing in your area and see if any are available in your area.
You would measure a tractor trailer in grams.
Any tractor need can be fulfilled by a Kubota Tractor. Kubota Tractors have a large array of tractors they manufacture for any situation that would require a tractor.