I thought this might be some useful information.
http://drivinglaws.aaa.com/tag/bumper-height/
Alaska
Modifications of original vehicle bumper height are permitted. Maximum frame height: 24 inches up to 4,500 lbs. GVWR; 26 inches for 4,501 to 7,500 lbs. GVWR; and 28 inches for 7,501 to 10,000 lbs. GVWR.
Arizona
Modification of original vehicle bumper is permitted.
Arkansas
Modification of original vehicle bumper height is permitted.
California
Modification of original vehicle bumper height is permitted. Maximum frame height: 23 inches for passenger vehicles.
Colorado
Modification of original vehicle bumper height is permitted.
Connecticut
Modification of original vehicle bumper height is permitted, up to 4 inches from manufacturer’s original height for passenger vehicle, up to 30 inches above roadway for commercial vehicle.
Delaware
No passenger vehicle or station wagon shall be registered or operated upon any highway of the state if the bumper height exceeds 22 inches from the ground to the bottom of the bumper.
District of Columbia
Modification of original bumper height is permitted.
Florida
Maximum bumper heights are as follows:
Vehicles with a net weight of less than 2,500 lbs: 22 inches.
Vehicles with a net weight between 2,500 lbs. and 3,500 lbs: front bumper, 24 inches; rear bumper, 26 inches.
Vehicles with a net weight of 3,500 lbs. or more: front bumper, 27 inches; rear bumper, 29 inches.
Georgia
Modification of original vehicle bumper height or altering suspension system is illegal if altered more than 2 inches above or below factory recommendations.
Hawaii
The maximum bumper height for passenger vehicles is 22 inches; for vehicles with a GVWR of 4,500 lbs. and under, 29 inches; for vehicles with a GVWR of 4,501 to 7,500 lbs., 33 inches; for vehicles with a GVWR of 7,501 to 10,000 lbs., 35 inches.
Idaho
Maximum bumper heights are determined by vehicle class and the GVWR. As such, the maximum heights are:
Illinois
The maximum bumper height on all motor vehicles except multipurpose passenger vehicles is 28 inches for the front bumper and 30 inches for the rear bumper, measured from the road surface.
Indiana
A passenger vehicle that was originally equipped with a standard bumper must have a bumper when operated on a highway. The height of the bumper cannot vary more than 3 inches from the original manufactured bumper height.
Iowa
Modification of bumper height is permitted.
Kansas
Modification of original vehicle bumper height is permitted.
Kentucky
Modification of original vehicle bumper height is permitted, provided Driver’s vision is not obscured.
Louisiana
Modification of original vehicle bumper height is permitted.
Puerto Rico
Modification of original vehicle bumper height is permitted.
http://drivinglaws.aaa.com/tag/bumper-height/
Alabama
Alaska
Modifications of original vehicle bumper height are permitted. Maximum frame height: 24 inches up to 4,500 lbs. GVWR; 26 inches for 4,501 to 7,500 lbs. GVWR; and 28 inches for 7,501 to 10,000 lbs. GVWR.
Arizona
Modification of original vehicle bumper is permitted.
Arkansas
Modification of original vehicle bumper height is permitted.
California
Modification of original vehicle bumper height is permitted. Maximum frame height: 23 inches for passenger vehicles.
Colorado
Modification of original vehicle bumper height is permitted.
Connecticut
Modification of original vehicle bumper height is permitted, up to 4 inches from manufacturer’s original height for passenger vehicle, up to 30 inches above roadway for commercial vehicle.
Delaware
No passenger vehicle or station wagon shall be registered or operated upon any highway of the state if the bumper height exceeds 22 inches from the ground to the bottom of the bumper.
District of Columbia
Modification of original bumper height is permitted.
Florida
Maximum bumper heights are as follows:
Vehicles with a net weight of less than 2,500 lbs: 22 inches.
Vehicles with a net weight between 2,500 lbs. and 3,500 lbs: front bumper, 24 inches; rear bumper, 26 inches.
Vehicles with a net weight of 3,500 lbs. or more: front bumper, 27 inches; rear bumper, 29 inches.
Georgia
Modification of original vehicle bumper height or altering suspension system is illegal if altered more than 2 inches above or below factory recommendations.
Hawaii
The maximum bumper height for passenger vehicles is 22 inches; for vehicles with a GVWR of 4,500 lbs. and under, 29 inches; for vehicles with a GVWR of 4,501 to 7,500 lbs., 33 inches; for vehicles with a GVWR of 7,501 to 10,000 lbs., 35 inches.
Idaho
Maximum bumper heights are determined by vehicle class and the GVWR. As such, the maximum heights are:
- Passenger cars, front: 22 inches; rear: 22 inches.
- Trucks and multipurpose vehicles, front: 24 inches; rear: 26 inches.
- Vehicles from 4,501 to 7,500 lbs. GVWR, front: 27 inches; rear: 29 inches.
- Vehicles from 7,501 to 10,000 lbs. GVWR, front: 28 inches; rear: 30 inches.
- 4-wheel drive or dual-wheel vehicles with a 10,000 lbs. or less GVWR, front: 30 inches; rear: 31 inches.
Illinois
The maximum bumper height on all motor vehicles except multipurpose passenger vehicles is 28 inches for the front bumper and 30 inches for the rear bumper, measured from the road surface.
Indiana
A passenger vehicle that was originally equipped with a standard bumper must have a bumper when operated on a highway. The height of the bumper cannot vary more than 3 inches from the original manufactured bumper height.
Iowa
Modification of bumper height is permitted.
Kansas
Modification of original vehicle bumper height is permitted.
Kentucky
Modification of original vehicle bumper height is permitted, provided Driver’s vision is not obscured.
Louisiana
Modification of original vehicle bumper height is permitted.
Puerto Rico
Modification of original vehicle bumper height is permitted.