Frame

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Helper doc: Doug and Steve's frame fabrication doc

Dimensions

56.5" x 108" cabin.

Basically 4.5' x 9' Frame, but 4.5 is interior cabin width. Walls are ¼” outside, ¾” framing, and ¼” inside. That is 1 ¼” x 2 = 2 ½” for both walls adding to the width. 54"+2.5" = 56.5". (Choosing at this time NOT to round up to 57".)

2" x 2" x 1/8" steel tube is trailer base stock.


Cabin Width
Bed + Walls = Width (external)
(4.5') 54" + (1.25 * 2) 2.5" = 56.5"
Length
Frame + Tongue dist = Total Length
(9') 108" + (5') 60 " = (14') 168" end to end
Bottom/Frame
Frame concept before really building it

Need to resolve before build

  • What's the tonguebox look like? (Black?) To hold: Battery, fuse block, chocks
  • Spare tire? If so, at what location?

Buy/Have before build

  • Metal stock
    • 2" x 2" x 1/8" tube:
      • 2 of 108" side rails
      • 2 of 74" tongue rails
      • 4 of 52.5" crossbeam rails
    • 3" x 2" x 1/8" tube:
      • 1 of 12" length for coupler mount
    • 1" angle x 1/8" (or 1" flat):
      • 2 of ~15" stabilizer straps
      • 2 of ~10" stabilizer straps
    • side-table mount tubing - 1" tubing x 4" long, 3/4" tubing should fit inside, 4 each.
    • bit of flat or angle in near the tongue wheel to help stabilize - TBD
Steel Cut Layout

Wesbar 25' @Amazon]

Later:

    • license plate mounting & light: thinking on back hatch
      • use light bolts: [1] (bottom of page) or [2] There are other sources, this is just to start with.
  • Primer & Paint or Bedliner
    • DIY tutorial: [3]

Dropped:

ideas

  • tack some hex nuts or washers down the side rails on the inside to zip-tie the lighting cables to.
Hex nut hangers for wiring



First notes:

  • Axle & placement
"My simplest rule of thumb is to put the axle between 35% and 40% of the frame length from the back – so 36" on an 8ft frame is bang in the middle at 37.5%! You can go as far forward as 45% of the frame length, but only if you have a light galley and intend to fit a heavy tongue box." - Doug and Steve's frame fabrication doc
  • Wheel size?
  • Requirement for brakes is 1500# ( [4] )
  • Prime & Paint
  • configuration
  • dimensions 4.5 x 9
    • Want a 4'6" interior?
      1. 54" interior width, full size mattress
      2. Add wall thickness x 2(i.e. ¼” outside ¾” framing and ¼” inside = 1 ¼” x 2 = 2 ½” for walls)
      3. Add tire clearance x 2 you decide...I fit them tight 1" each side x 2 = 2”
      4. Add offset of tire on wheel inside x 2(i.e. 4” from hub face to the back of the tire x 2 = 8”)
      5. Final dimension gives you hub face to hub face...order your axle
      6. Weld perches where you want to allow for exterior wood perimeter to shoot screws into for sides.
      • To sum it up: 54” + 2 ½” + 2” + 8” = 66 ½” Round it up to 67” and that is your axle width hub face to hub face.
  • levellers/stabilizers
  • wheel jack
  • Operating Lights

Axle calc when we were considering a full axle:

Axle Width
Bed + Walls + Tire Clearance + Tire Offset = Axle Length
(4.5') 54" + (1.25 * 2) 2.5" + (1" * 2) 2" ??? + (5.6 / 2 * 2) 5.6" = 64.1" ???? Call it 65"