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Old 03-24-2005, 06:54 AM   #1
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The cage structure for these coaches is appealing and somewhat unique.

This enlightening forum and the Show Hauler website have some spec information but perhaps a review in this section is appropriate.

A summary might include the materials in the cage, and the specs of the metal used (thickness of metal, thickness of the tubes, spacing of supports for sides, floor, roof, etc).

What is the material and thickness of the skins and the underneath storage bays?

The insulation of the sides, floor and roof.

What is the welding process and how is the coach secured to the chassis?

How were those specifications and materials determined? Do they vary from coach to coach?

In other words, for a novice to the truck conversion world like myself, how strong is strong enough?
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Old 03-24-2005, 12:59 PM   #2
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Floor: 2"x3" 11 ga tubular steel, 16" o.c.

Walls: 1"x1-1/2" 16awg tubular steel, 16" o.c. where possible

Around slide-outs, the box corners & top hat: 1"x3" tubular steel 16 ga.

Bins: Angle iron, 1"x1-1/2" 16 ga. Enclosed with Galvanized steel 20 ga.

The interior steel frame is wire welded together, no screws.

Interior walls are sheeted in 7/16" osb Board to tie the frame together. Floor is 3/4" Plywood.

Exterior Skin: .063 Aluminum in 4' wide panels. Panels are attached by 3M VHB tape. (Note: I have used this product and you cannot believe the strength of this tape when attaching metal) No rivets

Roof Exterior: .030 one piece aluminum

Insulation Interior: adhesive bonded all walls and ceiling surfaces with a highly efficient bubble type insulation.

Insulation Floor: first joist are covered with .040 alum. with ĺ " Styrofoam.

Coach Frame is U-Bolted on Oak planks to truck frame.

All wiring is to ANSI A119.2 & NEC code, R.V.I.A. certified. All 120vac lines are hi-pot tested.

There is a start.

Bill
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Old 03-24-2005, 01:38 PM   #3
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Quote:
Originally posted by warpath:
There is a start. Bill
That is a great start. Thank you for your thorough reply.

Was aluminum ever considered as a frame material given its tensile strength and favorable weight?

Any other methods considered for anchoring (or cushioning) the coach to the chassis?

How did those specs and materials come to be chosen oven larger or smaller sizes and distances? Was there a target strength calculation that needed to be met?

I admire all of the above factors that need to be addressed to make a durable coach including the many, many items that become apparent only to those who build these from the ground up.

John
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Old 03-24-2005, 04:27 PM   #4
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That is WAY more than a start, Bill! While it is possible that a coach MIGHT not have to be built as strong as that, it can't hurt either. I'll take safe construction over glitz and glamour ANY DAY. Kingsley could learn many lessons from this forum. Are you listening, Ralph Dickenson?
Gary
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Old 03-24-2005, 09:17 PM   #5
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.....I agree 100% with you guys.....today I was over at Stop Fure having extinguishers filled and tested [it's getting that time of the year again]I asked the owner about a system for coaches-he is looking into it.....course forman said " there is NO standards to follow so it ain't allowed" typical bullsh*t can't think that with out any laws against it it can't be done....frickin' idiots-no wonder they are poor hourlies.....Been in the box so long they can't think for themselves....any way I was thinking of a cylinder in a corner or on the ceiling that would activate due to rate of rise or flame-maybe dense smoke?.....working on it-will advise.....geof kaye
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Old 03-24-2005, 11:52 PM   #6
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Keep us posted Geof, sounds like a hot item......
...sorta like a certain Kingsley Coach we've been hearing about....
Gary
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Old 03-25-2005, 06:57 PM   #7
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Bill;
The siding is attached with 3M VHB, and you are right, you better have it where you want it because it will require another truck to remove it.
I have been removing panels that have been on for 4 years plus and they are a bear, details later still.
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Old 03-25-2005, 09:04 PM   #8
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.....I'll stick with the steel frame and Aluminum sheeting with the plywood interior.....should the thing roll over....bet I make it home-ugly, very ugly, but I should make it alive......geof kaye
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Old 03-26-2005, 03:17 PM   #9
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Quote:
Insulation Floor: first joist are covered with .040 alum. with ĺ " Styrofoam
For the sake of accuracy. Unless Showhauler has changed the constructiion since last May when was at the factory they are not using Styrofoam insulation in the floor.

They were using expanded polystyrene foam insulation "beadboard". This has a R value of R-4 per inch.

Styrofoam is the Dow Chemical Co brand of extruded polystyrene. It is R-5 per inch. It is not the same thing as beadboard.

Most of the RV industry uses beadboard even though many companies incorrectly call it Styrofoam.
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Old 03-26-2005, 06:15 PM   #10
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Quote:
expanded polystyrene foam insulation "beadboard". This has a R value of R-4 per inch.
For clarification and comparison, what are the R values for the floor and ceiling?
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