8.5′ x 20′ – 7000 lbs Deck-Over Trailer Plans

8.5′ x 20′ – 7000 lbs Deck-Over Trailer Plans

This is our longest 7000 lbs tandem axle deck-over trailer.  These plans are fully engineered and include so many options, because you expect more from plans at Mechanical Elements.

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Description

Description

Endurance Duty Deck-Over trailer plans at 7000# Capacity, with a 20′ deck.  These are blueprints to build and customize an awesome, tough, work partner.  Choose options like various sides, ramps, hitch style, deck style, and much more.  Even the options have options — like choices for ramp length and strength.  The design is for you, so make it the way you want it.  And, while it’s tough for the work, the plans make it straightforward to build.

Tandem Axle, 20′ Deck-Over Trailer Plans

The trailer described in these blueprints spans the legal limit of 8′ 6″ wide, with a 20′ long deck.  Tandem Axles give 7000 lbs capacity making this Deck-Over trailer one of the most popular sizes.  Yet, it’s more than just the trailer.  Plans also include options, and variations of options.  For instance, our research shows many owners wish their ramps were just a little longer — so our plans give options for ramp length.  Other trailer owners complained that their ramps are not strong enough — they bend!  So, we have options for you to make them beefier.  And, we include a chart with capacity by length so you can find your own sweet spot.

Giving you choices to build the trailer the way you want it is the Mechanical Elements way.  Then, designing for robust action, is all included.  In researching other 7000lb deck-over trailers we also found that many side rub rails had damage.  Yes, the rub rails did their job, but many have damage.  The more robust trailers have thicker rails, so this design includes a nice balance of thick and wide to give robust action.  The same is true throughout the trailer.  Again, it’s something to expect at Mechanical Elements.

Get the 20′ Deck-Over Trailer plans, then customize them to fit your specific needs.

7000lb Deck-Over Trailer Plans Options
Some of the options.  Plank deck, 8.5′ Ramps, Perimeter Rub Rails and Stake Pockets, Front Stop Rail, Tongue Tray Storage (hard to see), Pivoting Tongue Jack, Adjustable Hitch, and 15″ wheels.  Lots of options exist.

Related Products & Information

– Here is one size smaller:  8.5′ x 16′ – 7000 lbs Deck-Over Trailer Plans.
– And, one size heavier:  8.5′ x 20′ – 10000 lbs Deck-Over Trailer Plans.
– For a Lower Deck,  7000 lbs (not a Deck-Over), please see the  6’10″x 16′ Trailer Plans.
– Learn how we design plans specifically for a Deck-Over trailer.

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Specifications

Specifications

8.5′ x 20′ – 7000 lbs Deck-Over Trailer Plans

  • 8’6″ x 20′ nominal deck size Deck-Over trailer.
  • 7000 lbs Axle Capacity (which includes both trailer and cargo).
  • Tandem axles with equalized leaf springs.
  • Deck-over design with optional stake pockets and side rub rails.
  • Welded Steel Construction using rectangular tube for main beams.
  • Approximate base trailer weight ~ 1800 lbs (w/o Ramps, Decking, or Sides)
  • While the main design is a traditional Deck-Over trailer, plans also include many options.
    (Something you just don’t get with other trailer plans.)
  • Plans include options like Ramps (and ramp options), Raised Front Stop Rail, Various Sides, Deck Type, and more.  Some options are mutually exclusive.
  • Fully Engineered design by Synthesis Engineering Services.
  • Instructions explain the trailer build, step by step, with hints to customize for specific needs.
  • The download is a Zip file with drawings, illustrated instructions, and special part files.

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More About The Design Features

More About The Design Features

While the specifications are nice, here’s little more information to expound on the trailer features — 20′ Deck-Over Trailer.

  • * The trailer is 8 feet 6 inches wide (typical legal width limit), with a bed length of 20 feet 3.5 inches including the steel frame.  8’6″ width includes the rub rails.
  • Overall length with the tongue is 301 inches (a little over 25 feet) — which will vary a little with some options.
  • Trailer bed height will depend on design options.  Typical is ~34 inches, but will vary with tire size, spring shape, shims, load and other options.
  • 7000 lbs max capacity (combined axle rating)* using tandem axles rated at 3500 lbs each.  Load capacity includes the trailer weight with all options.
  • Suspension is leaf springs, double eye style, with equalizer.  Slipper type springs are acceptable.  Not for independent torsion axles (see this article).
  • Trailer weight will vary depending on design options.  The 7K base flatbed trailer is in the 1800+ lbs range, which includes the axles and wheels, but without decking, sides or ramps.  Options like sides, decking choices, and all the other options will change the weight.
  • Many options are in the plans.  Here is a list, yet it does not include everything.
  • Deck options — both material, connection options, with or without the wheel covers, etc..
  • Build the standard flatbed, or choose on of the sides options — permanent or removable — also in the plans.  Sides options have variations, including options for tie-downs, rub rails, stake pockets, etc..
  • Ramps are an option — Choose ramps that slide in (and store) under the deck (or not), then choose the ramp length and capacity you need.
  • Design includes options for a raised front rail (or not), and a tongue tray for special tools (or not).
  • Choose a mounted toolbox, a tongue tray, spare tire, etc. which are there for optional functionality.  Since some options are mutually exclusive, not all options are in the pictures here.

    Deck-Over Trailer Options
    Some of the many options included in these Deck-Over Trailer Plans.
    (20′ Deck-Over Trailer shown, others similar.)
  • The download package includes the full set of drawings along with illustrated instructions and CAD files for laser or water jet cutting of the tail plate and other option parts.
  • We provide the plans complete, the way we would want to receive them.  We think they are much more complete and more detailed than any of our competitors.

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Maximizing Your Project

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