Med Duty tow rig questions

Most MDT with air brakes are 26,000-36,000 GVWR. Most without air brakes are 19,000-26,000.

carringb wrote:

BigBaron wrote:

Many I've "met" there had an MDT and it wasn't enough, especially after they got a bigger trailer.

Here's an MDT that he is going to have to upgrade because his new trailer is too heavy.

:h

I don't see how an RV trailer could overload an M2. Rear axle is rated for 20,000 pounds (they offer higher, but you need an overweight permit to utilize those on the highway) and combined weight up to 80,000 pounds.

An HDT that is singled out will have less pin weight capacity because you still can't go over 20,000 pounds on an axle, but the tare weight of the HDT will be higher.

From experience, the MDT is not overloaded from a weight capacity standpoint,…it usually ends up being the performance that a lot of people are unhappy with. Yes, the HDTs have bigger and better braking,…no doubt about that. The problem is that it takes you much longer to accelerate. Another problem is that you have an 18k lb trailer that slows you from 60+ mph on a 6% grade, all the way down to 30-35mph. That's why I love my 525hp motor that sits under my hood. I mostly only drive 60 or 65 mph when I'm towing my trailer. There have been times when i have been stuck behind semis, and have been able to switch lanes and accelerate to pass them on a those 6% grades. When I used to have my MDT, I would always get stuck behind them, or they would pass me on the hills. While my MDT was dropping down to that speed, it was always working the engine pretty hard too.

Something to think about as far as the weights and axle ratings are concerned,…most of the MDTs only gross about 19.5k lbs. They average about 13k lbs by themselves. That would leave you with 6k+ lbs for payload or pin weight. That's about what I'm working with on my HDT.

hone eagle wrote:

NTORACN wrote:
HDT's are good affordable, powerful tow rigs. However, feeding a 10 liter engine yields about 5 or 6 MPG. I think an MDT will yield around 10 or 11 MPG and is overbuilt for the 20 to 25,000 Lbs my loaded trailer will probably weigh. Thanks for the advice.

Dennis M M wrote:
Personally I think you will be way better off looking at a HDT instead of an MDT.

Much greater capability and a lower cost of entry.

Do some reading on the Heavy Duty Truck Forum

Not true ,most do close to 8-9 mpg
Mine runs 9.5 on a U.S. gallon

Mine gets 9.5+ running 60 mph,…and that's with a 15L motor.

Actually an HDT is cheaper than an MDT. I know of a sweet Peterbilt with a car deck that is $30K right now. MDTs are around $60K and up.

That big brown trailer is around 33,000 lbs. and well over $200K if I remember correctly. The MDT that pulls it has a 9-liter engine. It pulls it just fine, but works hard on hills.

The Heavy Hauler Resource Guide is a great source for info. It's also fun to read!

BigBaron wrote:
Escapee's HDT forum is good, too.

Many I've "met" there had an MDT and it wasn't enough, especially after they got a bigger trailer.

Here's an MDT that he is going to have to upgrade because his new trailer is too heavy.

Absolutely drooling over that truck! If I won the lottery I'd buy almost that exact truck (singled w/ sleeper), get a CDL, and yank RV's, boats, and other loads around the country just for fun.

(Remember, I won the lottery, so profit margin is unimportant LOL)

BigBaron wrote:

Many I've "met" there had an MDT and it wasn't enough, especially after they got a bigger trailer.

Here's an MDT that he is going to have to upgrade because his new trailer is too heavy.

:h

I don't see how an RV trailer could overload an M2. Rear axle is rated for 20,000 pounds (they offer higher, but you need an overweight permit to utilize those on the highway) and combined weight up to 80,000 pounds.

An HDT that is singled out will have less pin weight capacity because you still can't go over 20,000 pounds on an axle, but the tare weight of the HDT will be higher.

THANK YOU for everyone's help and info. I know a modern 1 ton dually could get the job done, but I prefer not to operate at the weight limits of the truck. MDT's and HDT's are over built for what I need it for and should be a pleasure to drive because it won't be maxed out.

Have a good one.

I have a 1999 International 4700 low Pro with the Stalic box. I bought it used in 2002 with 40,000 and it now has 110,000. In all that time and miles I have replaced 1 water pump, 1 relay,a set of batteries, a set of shocks and 1 small gasket to stop a oil leak. It needs tires and they will be replaced in the spring. It has been as close to bullet proof as a truck can be. It has the 4:44 rear axle and the International 530 cube 300 hp with the Allison 6 speed and 22.5 tires. Perfect combo for anyone to drive. It does slow down going up some elevations but that is the way it runs, never over heats and no signs of it wanting to not make it up the mountain. Over all this time the average fuel consumption is 7.5 and most all the driving was towing my 17,500 trailer. When I was full time the truck weighed 14,100 lbs without the 4,400 lb pin weight added.I'm sure now the value is close to nil on a truck of this age and mileage, but at the time it was the truck we needed to safely STOP my rolling house. Most anything would pull that trailer, but stopping was my main concern. It has huge disc hydraulic brakes at all four corners. No air brakes and I know it was an option at the time of build, the previous owner opted not to have them.

Escapee's HDT forum is good, too.

Many I've "met" there had an MDT and it wasn't enough, especially after they got a bigger trailer.

Here's an MDT that he is going to have to upgrade because his new trailer is too heavy.

NTORACN wrote:
Thanks for the info Hone Eagle.

Does having air brakes in a non commercial application require a class A license? Not sure if the little woman would want to learn shifting a road ranger tranny. I was also looking at using the MDT as a vehicle to drive around when at our destinations when not bringing my Landcruiser. Not sure if I would want to drive an HDT on city streets too much. Not that an MDT is as easy as a compact car to park, but seems to be a happy medium between the HDT and a LDT. I will revisit the HDT option again before rendering a decision.

Merry Christmas

hone eagle wrote:

NTORACN wrote:
HDT's are good affordable, powerful tow rigs. However, feeding a 10 liter engine yields about 5 or 6 MPG. I think an MDT will yield around 10 or 11 MPG and is overbuilt for the 20 to 25,000 Lbs my loaded trailer will probably weigh. Thanks for the advice.

Dennis M M wrote:
Personally I think you will be way better off looking at a HDT instead of an MDT.

Much greater capability and a lower cost of entry.

Do some reading on the Heavy Duty Truck Forum

Not true ,most do close to 8-9 mpg
Mine runs 9.5 on a U.S. gallon

Spend some time as suggested on the HDT forum
no 'class A or cdl' required ,they are either motorhomes or private plated mine is a motorhome and less to insure then my previous SD.
automated transmission, DW drives it bobtail- no clutch peddle.
cost per mile is the same as my old 7.3 because of the size of the tanks I can fuel in the cheapest state every 2000 miles or about once a season.
Come to one of the rallies for HDT's bring the wife if she thinks you are loon and meet the other ladies.
While you shop and drive MTD's ask the following -?
-how quiet is this MTD?,(my floor is 3" thick)
-are the doors double sealed that is 2 offset rubber gaskets on the perimeter?
-air bag suspension on ALL axles?
-air suspended cab?
-air suspended seats?
Those are some pro's ,there are also some cons ,head over to the escapees and read and read
many have come from MTD's and will recommend skipping them unless it meets a very specific need.