There are quite a few types of longboards so you will get various answers. There are slalom longboards, mini longboards, downhill longboards, carving and pumping longboards, sliding longboards, and many others. Usually you would pick a width according to what you prefer and how big your foot is.
The answer to your question is in the questiong itself.
Yes, just swap your bearings from skate wheels to longboard wheels, its all the same.
No, you'll need some stronger type of wood.
Depending on shape (Gun,Performance longboard etc.) 20 1/2 - 24"
longboard races
If you want to know when someone would use a longboard skateboard, it would be if they are wanting to go fast. The longboard's design is different than a normal skateboard designs which allows it to go very fast.
VOLADOR 42inch Freeride Longboard. Playshion Drop Through Longboard Cruiser. Magneto Bamboo Longboards. JUCKER HAWAII Original Longboard. Slendor Longboard 42 inch Drop Through. Landyachtz Switch Longboard Complete and Colors.
longboards trucks will work on a normal board. but they are usaly a lot less lite. they will also stick out a couple of inches on both sides.
its not the longboard...its the longboarder
This question is very broad. This depends on the construction, length, width, and shape of the specific longboard. A bamboo or maple longboard will not be as strong as a longboard that is reinforced with carbon fiber or fiberglass layers. A shorter longboard will be less prone to breaking because it will be stiffer. Just research the materials, length, and shape to see approximately how strong a specific board is.
100 cm
Normal width of a single car garage is 8' feet. Normal width of a double car garage is 16' feet. These answers are for doors typically found in the USA.