Ivylog wrote:
Most class 8 are 10-13 speed manual tranny and overkill for even the biggest RV. Are you sure you want to be a gear jammer? Unfortunately most class 6 are usually less than 300 HP but more likely to have a Allison auto tranny or a 6-7 speed synchronized manual. Also, most have some type of body so no hitch. The Cat 3126 powered truck rarely make it to 500K without engine problems... read what's been done to this truck. The Cummins 8.3 is a much better engine but many trucks with a Cummins will be the 5.9 or newer 6.7. Extended cab or crew cab trucks are very rare, especially if it has 300+ and an Allison. I looked for over a year before I found a M2 crew cab with a 330 MB/Allison. I was not willing to spend this much money on one.
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"Most class 8 are 10-13 speed manual tranny and overkill for even the biggest RV."
Mostly incorrect!!Actually "Autoshift" (clutch for start & stop only) trannys have been around a long time.
Ditto for
*Fully* automatic ("2-pedal") trannys such as Freedom Line and Ultra Shift..;)
Volvo (and other mfgrs) have come out with their own automatics. Volvo's is the "I shift" - and many fleets are moving to the automatics due to the fuel savings - yes, usually the tranny *IS* smarter than the driver!
Even newer used HDTs -with I-shift auto trannys- can be had for less than the cost of a new pickup....and *completely* refurbished trucks can be purchased for less than the (new) MDT in the quoted post (above) - from companies such as Greg Shields' RV Haulers.
Besides Volvo, fully automatic trannys can be found in the Pacar brands and Freightliner HDTs
Allison trannys are *not* found in HDTs (with the exception of fire apparatus, trash trucks, etc.) as they are *not* suited for lengthy OTR service.
"Gear Jammers":
"Row-your-own" Manual Transmissions are not a bad thing!..:S
No need to use all the gears - and "float shifting" (without using the clutch) is an easily learned skill.
Of course when you come to a full stop - you must "clutch".
Overkill:
Is a good thing!
An engine with a B-50 of 750K to 1 million miles, and designed to pull an 80K trailer - and still get the same mpg as an MDT is pretty nice!
A truck designed for OTR driver creature comfort (vs "around town" delivery service) is pretty nice too..:C
BTW - charts for B-50 ratings of various engines are no secret.
"Beat Up":
Most fleets (and independent operators) maintain their HDT's in excellent mechanical condition.
Governed speed is common for fleets, and driver abuse of equipment is not tolerated. (Down time for either - is money lost).
Many states do *not* offer registration of MDTs as non-commercial ("Private Truck").
Consequently, an MDT requires commercial plates (ex: CA) - which means you are paying for the load carrying capacity of the truck - along with lots of other (commercial) hoops to jump thru.
An HDT can be registered as a Motor Home - even in CA.
*No* special Driver's License required.
Suggest readers visit the Escapees HDT (and MDT) forums as posters have suggested.
The HDT Forum has an *outstanding* Resource Guide, which can be accessed via the Escapees forums -
*-HERE-*-or-
via the web at -
HH RV Resource GuideBe sure to click the "photo" section of the Guide to see lots of HDTs.
Lastly, there are several HDT owners who have *extensive* web sites with lots and lots of information.
Jack Mayer's is an excellent example -
*-HERE-*.