A 4000 series Great Mountain Climber (GMC) with a 16 ft steel box more than likely also has a hoist under the box, pushing the weight to close to 9000#. Add no brakes or steering & you have the tail wagging the dog. Bumper pull RVs typically don"t weigh more than 6000-6500#, they all are required to have brakes, & carry 15% of that weight on the hitch. Bigger RVs with 5th wheel hitch might go up to 8000, but carry 40% or so on the hitch. Typical big rigs gross up to 80000#, but carry 12000# on the steering, 34000# on drive tandems, 34000# on the trailer tandems. They also have brakes on all wheels. Add it up, 46000# on the tractor & 34000# on the trailer. You say 35 mph is doable. Put a decimal point in there, make it 3.5 ( three & a half) mph might be a better figure. End of rant. Willie diesel pilot-retired with over 40 years experience
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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