Annual permits are available for Mobile & Manufactured Homes in Oregon.
The vehicle towing the mobile home must be equipped with dual wheels on the drive axle and shall have enough engine horsepower to maintain minimum speeds of 45 MPH on Interstate highways and 35 MPH on other highways. In addition, the vehicle towing the unit must have a minimum GVWR of:
8,000 pounds when the base width is up to 10 feet or the overall width is up to 11 feet;
15,000 pounds when the base width exceeds 10 feet up to 14 feet or the overall width exceeds 11 feet up to 15 feet;
32,000 pounds when the base width exceeds 14 feet or the overall width exceeds 15 feet.
A minimum of two spare tires must be carried for the unit being towed; they are to be inflated and ready for use.
The unit length (inclusive of tongue) cannot exceed 80 feet in length.
The overall combination length cannot exceed 110 feet.
The base width cannot exceed 16 feet, and the overall width cannot exceed 18 feet.
A unit may have an eave providing it does not exceed either side by:
More than 30 inches for units with a base width of less than 16 feet;
More than 16 inches for units with a base width of 16 feet.
Note: If the eave extends more than 24 inches beyond either side of the unit, in addition to all other lights required by law, a clearance light as described in ORS 816.200 shall be mounted on the outermost front and rear corners of the eave.
Mobile homes exceeding a base width of 14 feet must:
Have a minimum of four axles, except units that do not exceed 40 feet in length may be equipped with three axles;
Have brakes that comply with Federal Motor Carrier Safety Regulations 393.42 (b)(2), provided the combination of vehicles meets
the requirement of 393.52 brake performance.
Modular building units must be transported with a truck-tractor or toter and semitrailer or trailer combination. The unit must be securely fastened to the semitrailer or trailer. Requests for moves using trailers more than 53 feet in length will be authorized on an individual basis and must be specified on the permit:
Stretch-trailers may be used for units non-divisible in length; when operating unladen the stretch trailer must be reduced to
dimensions authorized by statute or rule.
Fixed trailers or semitrailers may be used for units non-divisible in length, and must not exceed 75 feet in length.
WEIGHTS AUTHORIZED BY THIS PERMIT ARE SUBJECT TO ALL OF THE FOLLOWING LIMITS:
Tires may carry up to 600 pounds per inch of tire width or the manufactured sidewall rating, whichever is less.
Permits issued authorizing Permit Weight Table 1 or 2 allow up to a maximum of 20,000 pounds on a single axle and 34,000 pounds
on a tandem axle.
Permits issued authorizing Permit Weight Table 3 or 4 for movement of a single modular unit allow up to a maximum of 21,500
pounds per single axle and up to 43,000 pounds per tandem axle. When operating with Permit Weight Table 3 or 4, only those items that are manufactured as part of, and are attached to the unit, are authorized. Accessory parts (ship loose material) loaded inside the unit are not authorized. Auxiliary axle(s) must be deployed when operating at Permit Weight Table 3 or 4.
All groups of axle weights shall not exceed the sums of the permittable axle weights, or the weights allowed by the Permit Weight Table, whichever is the lesser of the two.
Combined gross weight shall not exceed that specified on the permit.
Source link: https://www.oregon.gov/ODOT/Forms/Motcarr/2352.pdf