What you carry will depend if you will be staying in motels or camping. When camping you will have to carry the tent, the sleeping pad, the sleeping bag and cooking equipment. If you going through very cold weather a much heavier sleeping bag and pad will be needed. The type of weather you are likely to run into will also affect the clothes needed. You might start the trip from a hot location and end up traveling through cold mountains or high altitudes were it will most likely be cold. You will need clothes for warm and cold days. You have to be prepared for the unexpected too.
The duration of the trip and location will throw another curve into the decision. Everyone should have a few basic tools but if the trip is to remote locations you might need a better assortment of tools. You might even have to carry tires if the country you are traveling through doesn't have them. You will have to think about fuel, will your motorcycle have the range needed for certain areas.
The photo below shows how my Super Tenere was loaded the day before my 34 day trip to Alaska. I camped most of the time, I'm a good packer.
The size of your motorcycle will determine how much equipment you can carry too. On my Super Tenere I can carry quite a load but some world riders ride much smaller bikes. I'm reading a blog of a woman travelling around the world on a Honda CRF250. I followed the couple below as they traveled around the world on two SYM Symba 110. You can read about their adventure here:
Underboning the World - 2 Symbas, 1 Couple, No Sense
I have also seen riders that go completely overboard with their equipment to the point of making the motorcycle dangerous to ride in my opinion. If you have to ride through soft sand or mud you want the weight on the bike as low as possible and if you tip over you have to be able to pick the bike up again by yourself. Below are two examples of amazingly overloaded motorcycles.
Now if money was no objection and I was going to travel the world for a few years then maybe something like the truck below would be better. I would drive the truck to a new country or location, park it and then use the motorcycle to explore the country. I could have all the amenities of a home and still have the motorcycle for short distance adventures.
When I was in Alaska I met a German couple that was traveling the world in one of these but they were not carrying a motorcycle. For me a motorcycle would be a requirement.
The trucks are great but the cost of the truck and the transportation to different countries can make it extremely expensive. A truck like the one above can cost up to a half a million dollars.
So as you prepare for you next big adventure, think about what you will need, make a list and then remove half the stuff. You can always buy equipment as needed. Maybe you don't need heavy clothes for cold days for half your trip, you could pack light and later buy or have the warmer clothes shipped to a location on your trip or vice versa, start with heavier clothes and equipment and then ship it home when it is no longer needed. If you are traveling with a companion and both have the same motorcycle, maybe you can split the tools. If you are a couple traveling together on two motorcycles than one can carry the tent and sleeping bag while the other can carry the cooking utensils and sleeping pads. One carries the computer and the other the cameras. What's important is that you travel as light as possible while still prepared for the unexpected.
If you have to carry the house on the motorcycle than it's no longer a motorcycle adventure.