That was this time. It is not a good idea to tow the trailer you are towing
with your BMW.
That's backwards. If your hitch was rated at 3750, then a 100% margin of
error would let you safely tow a load that weighed 1875. A trailer weighing
in at 7500 pounds would exceed the capacity by 100%, and that is never a
margin which is in your favor. If you wanted the margin to be in your favor,
you would need to keep your load below the rated capacity, not above it.
The point is, I didn't expect to have happen what did happen, and when it
happened it was a very dangerous situation that developed within a matter of
seconds after having gone for minutes without any problems at all. The point
isn't what was on the trailer, or what I was using to pull the trailer, the
point is that the situation can go from OK to really shitty in the blink of
The side bar issue is that your BMW hasn't got the frame and structural
support to be handling a trailer like that.
Closer to level is always best, but you don't need a transit and a plumb
line to make sure the car is level. Your garage floor or the street in front
of your house is level enough, or the parking lot at the store where you are
going to buy a quart or two of oil should be fine too.
Was the oil level OK, or was it low? If it was low enough to be a problem,
it would be well below the MIN line on the dip stick. If it was only to the
MIN line, then it should not be feeding you low pressure indications.
It's a good idea to tow it, just not when it's overloaded.
Obviously, the hitch is designed for a higher weight than it's rated
for. Just imagine what would happen after a few years with rust, dents,
normal wear and tear, etc. otherwise.
Right, but there must have been clues something bad was about to happen.
The trailer won't just take control out of the blue, you must have done
something. Braked too hard, jerked the steering wheel, driven too fast,
And just how do you know this?
If IIRC it was about halfway between min. and max.
Is this a troll? 2 seconds space is OK for an unladen car in perfect
weather conditions. The space should be doubled when towing. Yes, I
know it ios difficult, but you should also be driving slower anyway...
One sec is enough for good weather conditions, so I did double my
following distance. Driving slower would not have made it safer because
then everyone and their grandmother would have passed me, including the
Following by one second ot two is not a matter of your speed, its a matter
of your following distance. You can follow by 5 seconds and still do 50 or
55, or whatever. Fred is telling you that you follow too close, not that you
go too fast. It's me that told you that you go too fast ...
No, it's not, and if you believe that it I hope that you do not ever
drive behind me.
In an emergency situation, where you are unaware of the need to brake
until you see the car infront's brake lights, you would be hard pressed
to get your foot from the gas to the brake and actually begin to slow
down in 1 second.
Who cares who is passing you. Having cars and/or trucks passing you
does not constitute an unsafe condition. As the operator of your
vehicle you need to decide what the proper speed for that vehicle under
those conditions is, not let the speed of other traffic make that
decision for you.
I tend to drive the speed most of the other traffic is doing. Driving
slower would have forced the other traffic going 55 mph into the left
lane where the speed was 65-75 mph. Besides, I *did* make the, IMO
correct, decision that 55 mph was a safe speed for me.
You don't have to be 100 years old. Even the younger drivers will take
upwards of a second before they can even start braking. Add the fact
that your overloaded tow rig is going to come to a stop slower (further)
than an unladen car and you are just about assured you will have a
collision following only 2 seconds with the trailer.
All I can say is stay over there (wherever you are). I don't want to
see you riding up my tail with a heavily loaded trailer being towed by a
car not designed to tow heavy trailers.
and as an experiment, try testing your own reaction time here:
But don't forget that this is your eye-hand reaction time. You will be
*significantly* slower when you have to lift your foot from the
accelerator and stomp on the brake pedal.
While I agree with the tenor of your post Jeff, the trailer brake thing
is not quite true. Many trailers have self actuated hydraulic brake
systems. There is a sliding hydraulic actuator assembly integral to the
tongue of the trailer. In these systems it is the weight of the trailer
pushing against the hitch that actuates the drum or disk brakes. Pretty
It is a common set-up on boat trailers (I have it with drum brakes on
mine), though I can't tell from the picture if Ulf has these on his
Solid rock has specific gravity of 2.7 - 3.2 density and some sands (such as
as Zircon sand) 4.6!
Your weight estimate may be a lot low.
If your ABS is coming on in the dry then the total load or its distribution
may be out of limit, however that is what it is there for and although it
may indicate that you are pushing it and may not stop in time, you are
unlikely to hurt the brakes.
Not so the engine and transmission, which are not going to like dragging a
truck load of sand about for very far.
I don't know. The max load for the trailer was just under one ton, so I
find it very unlikely that the weight of the sand was much more than
twice that. With a density of 3 tons/m^3 we're talking five tons, and
that's a lot.
Come on, it's a BMW. It's designed to driven 155 mph all day long on the
Exactly. I wouldn't trust it to tow a trailer load of post-holes :-p
> It's designed to driven 155 mph all day long on the Autobahn... :-)
By that logic, an Indy car should be able to tow a cement mixer :-)
I don't know if the maximum trailer weight is specified for cars in
the US, but in Sweden this weight is specified, and my '01 Audi A6 is
specified at 1900 kg maximum. I would assume that a bmw would have a
similar specification. Maximum tounge weight is 85 kg.
It is specified. In all honesty, a BMW should be able to tow a small
trailer as well as anything else, provided its properly equipped. I
*might* try to tow a load of sand like that behind my '73 Plymouth, but
I sure wouldn't try it behind my wife's 93 Intrepid, or a BMW though.
Modern cars are a lot less overbuilt than old solid-axle American iron,
and don't have nearly as much overkill in their towing capacities either.
I'm guessing that this had everything to do with the hill and nothing to
do with the trailer, *except* that the additional weight on the trailer
tongue would tilt the car even more than normal for that particular slope.
I don't pretend to know diddly about BMWs so I don't even know if this
applies to the engine in yours, but I happened to read this a while back:
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