http://www.iowadot.gov/mvd/omve/truckguide.pdf
Commercial vehicle - Any self-propelled or towed motor vehicle used on a
highway to transport passengers or property when:
In Interstate Commerce
A single vehicle has a gross vehicle weight rating or gross vehicle weight
more than 10,000 pounds; or A combination vehicle has a combined weight rating or gross combined
weight more than 10,000 pounds
Commercial Driver’s License Exemptions
Farmers and Farm Helpers
Drivers of commercial motor vehicles under the control of the farmer and used
in their farm operation may claim an exception from the requirement to have a
Commercial Driver’s License, provided all of the following conditions are met.
• must stay within a 150 air-mile radius of the home farm; and
• must transport supplies, equipment, or products for that farm operation;
and
• must transport from farm site to farm site (sale barn), or to and from the home farm;
and
• may not transport for-hire, but may exchange services with other farmers.
Generally, drivers of farm operated commercial motor vehicles may operate
across state lines within a 150 air-mile radius of the home farm, provided the
neighboring state recognizes the CDL exception from the state of issuance. It
is advisable to consult with the officials of a neighboring state before crossing a
state line.
Lightweight Combinations -
Farmers and Private Carriers of Livestock or Ag-commodities
A motor truck in combination with a trailer or semitrailer, operated by a farmer
or private carrier hauling horses, with county level registration or special farm
registration may qualify for a gross registration weight exception.
Registration of trailers
Farm Trailers
Unlike implements of husbandry (farm machinery) that by design have an exclusive agricultural
purpose, farm trailers are designed and could possibly be used for many
purposes, not just agricultural.
Bumper-hitch livestock, flatbed, and utility
trailers are examples of vehicles that could be considered farm trailers if used
exclusively in a farmer’s agricultural operation. When operated as a farm
trailer, they are not subject to registration. However, farm trailers are subject
to the same lighting, safety and axle weight regulations as registered trailers.
Semi-trailers and
gooseneck trailers may not be considered a farm trailer and
must be registered. Bumper-hitch livestock, flatbed, and utility trailers used
outside the scope of a farmer’s agricultural operation must also be registered.