I'm guessing you're referring to the weight classifications.
Trucks are classified by gross vehicle weight rating (GVWR), which is the amount a vehicle would weigh when loaded to the maximum amount it is designed to carry (i.e., it is the sum of the weights of the truck itself, the driver and any passengers, and a full load of cargo).
There are actually eight classifications, not five. They're numbered; Class 1 is the lightest, and Class 8 is the heaviest. The classes are then grouped: "Light Duty" trucks are Class 1, 2, and 3; "Medium Duty" trucks are Class 4, 5, and 6; "Heavy Duty" trucks are Class 7 and 8.
Class 1 includes everything up to 6,000 pounds, which includes small- and mid-size pickup trucks like the Toyota Tacoma or the Chevy Colorado. Class 2 are regular full-size pickups like the Chevy Silverado, Ford F-150, and some large SUVs like the Ford Excursion. Class 3 are the "HD" pickup trucks: the Silverado HD and the Ford F-350.
Class 4 includes very heavy duty pickup trucks like the Ford F-450.
Class 5 is where you really depart from vehicles likely to be owned and driven for personal use: the Chevy Kodiak is an example.
Class 6, 7, and 8 are filled by very heavy commercial trucks: flatbed tow trucks, dump trucks, and semi tractor-trailers.
See the related link for further information.
Permission levels 1 and 5, plus organization access
The five levels of organization are the following in order: 1.) cells 2.) tissues 3.) organs 4.) organ system 5.) organism
ecosystem, biosphere, community, organism, population
Tissue -> Organ -> Organism -> Eco System -> Biome
1, 2, 3, 4, 5. levels
The five levels would be on like the organization in ecology.
Multicellular organisms have 5 levels of organization ranging from simplest to most complex...cells, tissues, organs, organ systems, organisms.
There are 7 levels of cell organization: organelles, cells, tissues, organs, organ systems, organisms, and populations.
(Atom -----> molecules ----->) cells -------> tissues ------> organs -----> organ systems -------> organisms
You can donate a truck to the following organization: http://www.actiondonation.org/DonateTruck.html
These are the levels of organizationLevel 1: CellsLevel 2: TissuesLevel 3: OrgansLevel 4: Organ SystemsLevel 5: OrganismsLevel 6: PopulationLevel 7: Community
The levels Organization in Living Things are below. This list refers to the anatomy of living things.CellTissueOrgansOrgan SystemsOrganismThe levels of Organization in Living Things in regards to ecology are below.IndividualPopulationCommunityEcosystemBiomeBiosphereThe levels of Organization in Living Things in regard to biological taxonomy are below, from smallest to largestSpeciesGenusFamilyOrderClassPhylumKingdomDomain