Re: Towing a 2000 lb boat w. a 2004 Ford Taurus
I know it's a little late to be responding to this old thread, but I can help to clarify Hitech's questions re. weight limits/rules for non-commercial vehicles while towing in California.
I've never seen (in CA) a law take makes it illegal to exceed the manufactures weight rating for the tow vehicle. Do you know which statute makes it illegal to be over the manufactures weight rating?
As authorized by the California Vehicle Code, a Peace Officer may, at his/her discretion, stop a vehicle that is deemed to be overloaded or operated in an unsafe condition. Here are some of the applicable laws (source: California Vehicle Code 2009, Divisions 11 and 12).
Basic Speed Law
22350. "No person shall drive a vehicle upon a highway at a speed greater than is reasonable or prudent having due regard for weather, visibility, the traffic on, and the surface and width of, the highway, and in no event at a speed which endangers the safety of persons or property." The premise here being that driving at
any speed while operating an overloaded (read: unsafe) vehicle upon a highway is considered a dangerous speed, thereby authorizing the Officer to initiate an enforcement stop on said vehicle he/she suspects is overloaded. This is referred to as a 'catch-all' section, and is intended to address any situation not specifically mentioned in other laws.
Vehicle Not Equipped or Unsafe
24002. (a) "It is unlawful to operate any vehicle or combination of vehicles which is in an unsafe condition, or which is not safely loaded, and which presents an immediate safety hazard." Self-explanatory.
Hitch, Coupling Device or Connection, or Tow Dolly
29003. (a) "Every hitch or coupling device used as a means of attaching the towed and towing vehicles shall be properly and securely mounted and be structurally adequate for the weight drawn. The mounting of the hitch or coupling device on the towing and towed vehicle shall include sufficient reinforcement or bracing of the frame to provide sufficient strength and rigidity to prevent undue distortion of the frame." Upon further inspection by the Officer, the prima facia evidence may support this violation.
Towed Vehicle
29004. (b) "All safety connections and attachments shall be of sufficient strength to control the towed vehicle in the event of failure of the regular hitch, coupling device, drawbar, tongue, or other connection. All safety connections and attachments also shall have a positive means of ensuring that the safety connection or attachment does not become dislodged while in transit." Another section that may be supported by the prima facia evidence.
Chances are most law enforcement officials are not going to notice a a couple of hundred pounds of extra weight, or make a fuss about it if your driving in a safe manner, but if excess weight causes the towed vehicle to whip or swerve, he/she could stop you using this section:
Towed Vehicles Swerving
21711. "No person shall operate a train of vehicles when any vehicle being towed whips or swerves from side to side or fails to follow substantially in the path of the towing vehicle."
I have seen a car towing a boat, which in turn was towing a jet-ski, which is a violation of this law [notice subsection (b) also]:
Passenger Vehicle Combinations: Number and Weight Limits
21715. (a) "No passenger vehicle regardless of weight, or any other motor vehicle under 4,000 pounds unladen, shall draw or tow more than one vehicle in combination, except that an auxiliary dolly or tow dolly may be used with the towed vehicle."
(b) "No motor vehicle under 4,000 pounds unladen shall tow any vehicle weighing 6,000 pounds or more gross."
So, as you can see, California (and I'm sure most other states) has lots of rules regarding weight limits while towing. There's two more non-weight laws that you might not be aware of:
Maximum Speed for Designated Vehicles
22406. "No person may drive any of the following vehicles on a highway
at a speed in excess of 55 miles per hour:
(a) A motortruck or truck tractor having three or more axles or any motortruck or truck tractor drawing any other vehicle.
(b) A passenger vehicle or bus drawing any other vehicle.
(c) A schoolbus transporting any school pupil.
(d) A farm labor vehicle when transporting passengers.
(e) A vehicle transporting explosives.
(f) A trailer bus, as defined in Section 636."
Notice section (b) includes passenger vehicles towing
any other vehicle (Section 670. A "vehicle" is a device by which any person or property may be propelled, moved, or drawn upon a highway) In a nutshell, 55mph is max on any California road while towing, including freeways.
Designated Lanes for Certain Vehicles
21655 (b) "Any trailer bus, except as provided in Section 21655.5, and any vehicle subject to the provisions of Section 22406 shall be driven in the lane or lanes designated pursuant to subdivision (a) whenever signs have been erected giving notice of that designation. Except as otherwise provided in this subdivision, when a specific lane or lanes have not been so designated, any of those vehicles shall be driven in the right-hand lane for traffic or as close as practicable to the right edge or curb. If, however, a specific lane or lanes have not been designated on a divided highway having four or more clearly marked lanes for traffic in one direction, any of those vehicles may also be driven in the lane to the immediate left of that right-hand lane, unless otherwise prohibited under this code. When overtaking and passing another vehicle proceeding in the same direction, the driver shall use either the designated lane, the lane to the immediate left of the right-hand lane, or the right-hand lane for traffic as permitted under this code."
This section basically says that any vehicle that meets the criteria of section 22406 above is also required to use only the right hand lane except when passing, and then, only pass in the next lane over. So don't get caught towing your boat in the left lane(s) of a four or more lane highway/freeway in California unless a sign permits you to do so, or you are preparing to exit/merge on that side.
Phew! California!

I'm burned out.