they are the gaps between the exhaust and the tyres that help to separate the two devices.
You mean between the rims? That's exactly what they are - spacers. Unnecessary ones, at that.
Who invented the Semi-truck?
If the semi truck knocked on the garbage truck, yes.
A vehicle with 18 wheels is commonly known as a "semi-truck" or "tractor-trailer."
Semi-articulated
There is no prefix in truck.
Tom Nelson invented the semi truck in 1945
The chassis of a semi truck.
Alexander Winton, in Cleveland, Ohio invented the semi-truck in 1898 and sold his first manufactured semi-truck in 1899.
its a semi
Yes.
You can look into semi truck leasing from companies such as Penske and Ryder. You can also look in the yellow pages for your area and find local companies that do semi truck leasing as well.