I am trying to think of a single vehicle component that's affected by GVW, but not GAWR, and can't.
Suspension, brakes, control arms, tie rods, etc., are all linearly related to axle weight. Therefore, they shouldn't wear excessively if axle weight limits are obeyed.
Powertrain systems are specified to GCWR, which is much higher than GVWR. In other words, if your transmission can tow 10,000 lbs, you can't hurt it by overloading GVW slightly.
Maybe the frame? But that's a long shot. There are many ways to induce more stress to the frame, without going over GVW. For example, placing a very concentrated load right in between the axles would induce tremendous bending forces on the frame, than being over GVW, but evenly distributed.
While that is true, it's no different than if you're at fault in an accident, and found to be over the speed limit by 2 mph. Your insurance can also be denied, based on the argument you over-drove the designed safe limit of the highway and therefore couldn't brake in time.
But I haven't seen a single real life case where someone is denied insurance due to over-load or speeding, that would render 90% of RV and sports car's insurances invalid!
For the insurance policy to deny you, they have to PROVE overloading was the cause of the accident. And like I explained above, that's difficult to do if I'm not over the GAWR. For instance, many GVW ratings are there for powertrain warranty purposes, and not safety. A Ram 2500 with a 6.4 Hemi can carry 800 lbs more than a 5.7 Hemi, with identical axles (and brakes). Therefore, how can I cause an accident just because I have a smaller engine?
Keep in mind if we go by hard technical specs, just about every mod we do renders the legal GVWRs and GAWRs useless:
- Bigger tires and or wrong wheel offset? Boom, there goes your axle rating, as it could over stress your bearings and brakes.
- Larger diameter tires? GVW, payload, GCWR all invalid due to gear ratio change.
- Lower brake pad friction rating (i.e. OEM is FF and you use ceramic EE pads)? Axle rating is gone.
- Lift kit? Every weight rating out the window.
- Winch bumper? A good lawyer can ding you bad if you hit a person, as it doesn't meet federal pedestrian safety standards!
I am not advocating careless over-loading, not at all.
But due to the nature of our hobby, we have to rely on our own safe judgement. If we "go by the book", then just about thing we do is technically "illegal", short of driving absolutely stock vehicles...
I am trying to think of a single vehicle component that's affected by GVW, but not GAWR, and can't.
Suspension, brakes, control arms, tie rods, etc., are all linearly related to axle weight. Therefore, they shouldn't wear excessively if axle weight limits are obeyed.
Powertrain systems are specified to GCWR, which is much higher than GVWR. In other words, if your transmission can tow 10,000 lbs, you can't hurt it by overloading GVW slightly.
Maybe the frame? But that's a long shot. There are many ways to induce more stress to the frame, without going over GVW. For example, placing a very concentrated load right in between the axles would induce tremendous bending forces on the frame, than being over GVW, but evenly distributed.
While that is true, it's no different than if you're at fault in an accident, and found to be over the speed limit by 2 mph. Your insurance can also be denied, based on the argument you over-drove the designed safe limit of the highway and therefore couldn't brake in time.
But I haven't seen a single real life case where someone is denied insurance due to over-load or speeding, that would render 90% of RV and sports car's insurances invalid!
For the insurance policy to deny you, they have to PROVE overloading was the cause of the accident. And like I explained above, that's difficult to do if I'm not over the GAWR. For instance, many GVW ratings are there for powertrain warranty purposes, and not safety. A Ram 2500 with a 6.4 Hemi can carry 800 lbs more than a 5.7 Hemi, with identical axles (and brakes). Therefore, how can I cause an accident just because I have a smaller engine?
Keep in mind if we go by hard technical specs, just about every mod we do renders the legal GVWRs and GAWRs useless:
- Bigger tires and or wrong wheel offset? Boom, there goes your axle rating, as it could over stress your bearings and brakes.
- Larger diameter tires? GVW, payload, GCWR all invalid due to gear ratio change.
- Lower brake pad friction rating (i.e. OEM is FF and you use ceramic EE pads)? Axle rating is gone.
- Lift kit? Every weight rating out the window.
- Winch bumper? A good lawyer can ding you bad if you hit a person, as it doesn't meet federal pedestrian safety standards!
I am not advocating careless over-loading, not at all.
But due to the nature of our hobby, we have to rely on our own safe judgement. If we "go by the book", then just about thing we do is technically "illegal", short of driving absolutely stock vehicles...
I'm wondering if I understand correctly. I have a '16 tacoma. GVWR = 5600 Ibs. GAWR fr=3040Ibs, GAWR rr=3285Ibs, so total GAWR = 6325Ibs.
Keep in mind the FWC Taco guys travel solo most of the time and travel light. The Wander the west peeps typically couples Toyotas are actually the exception not the norm due to load limits issue.Good points on the overall everything is illegal. I think this is good discussion; I am still not sure where I come down on the issue... buy more truck or just go with the size you want (e.g. a Taco instead of a RAM). I know the FWC dealers that drive Tacos with FWC campers on them... as well as Jonathan Hansen at Overland Tech has a nicely tricked out FwC complete with indoor shower on a Taco. Both have more experience with trucks, overlanding, and offroading than I will most likely have in my lifetime so I guess if the approach is good enough/safe enough for them than not sure why I have a problem with it... maybe its the risk averse finance/accountant in me struggling with my adventurous spirit. Either way, good discussion to help people decide what level of risk they are willing to accept.
Nooooo. The GAWR front and rear are the maximums for each axle, but they do not add to find a "total GAWR". The GVWR is still the upper limit for combined weight of the vehicle.
With a GVWR of 5600lbs, if you load the rear axle to the maximum GAWR of 3285lbs, then you can safely put a maximum of 2315lbs on the front axle (5600-3285).
The same is true for the GCWR (Gross Combined weight, which includes a trailer if present). The 2016 Tacoma has a GCWR of 11360 lbs, but advertises a towing capacity of up to 6700lbs, depending on configuration (and as low as 3500lbs). If your loaded truck comes in at exactly 5600lbs, then your real towing capacity is (11360 - 5600) = 5760lbs. If you need to tow a 6700lb trailer, then you need to reduce the truck's real curb weight, or vice versa.
Keep in mind if we go by hard technical specs, just about every mod we do renders the legal GVWRs and GAWRs useless:
- Bigger tires and or wrong wheel offset? Boom, there goes your axle rating, as it could over stress your bearings and brakes.
- Larger diameter tires? GVW, payload, GCWR all invalid due to gear ratio change.
- Lower brake pad friction rating (i.e. OEM is FF and you use ceramic EE pads)? Axle rating is gone.
- Lift kit? Every weight rating out the window.
- Winch bumper? A good lawyer can ding you bad if you hit a person, as it doesn't meet federal pedestrian safety standards!
I am not advocating careless over-loading, not at all.
But due to the nature of our hobby, we have to rely on our own safe judgement. If we "go by the book", then just about thing we do is technically "illegal", short of driving absolutely stock vehicles...
Hi RoyJ,
Thanks for all this insight. I'm wondering if I understand correctly. I have a '16 tacoma. GVWR = 5600 Ibs. GAWR fr=3040Ibs, GAWR rr=3285Ibs, so total GAWR = 6325Ibs. When loading my tacoma, with rear airbags to properly distribute the weight, as long as I'm under this total GAWR things should be generally okay for driving? (of course, driving style changes in consideration of all this weight... longer break distance, slower on turns etc...).
What are the risks of going ~200 Ibs above GAWR?