What do the critics think of this design to hold the 2 tanks between the frame rails? If the angle steel is, say, 2" x 2" x 1/4" and the square tube is 2x2x 1/4"? Think 1/2" grade 8 flange bolts from the angle to the frame, and one big 3/4" grade 8 flange bolt holding the tube to the angle. This is not dissimilar to how the 60 gallon diesel tank is held, though it uses one preformed piece where I am using 3. Please ignore my sh!t drafting. I am just throwing these out there because that is what I have readily available. I would do 3 or 4 of these to hold the 2 tanks, and have some sort of "cradle" for the tanks made of some smaller stuff.
Originally Posted by aaronsb
Instead of plywood, go buy some lengths of galvanized steel decking. Install it in your pan frame (with hopefully some more vertical supports) so the deck ridges are left to right (the shortest possible span)
You can use the same stuff for supporting the tank walls, as well.
Make sure you treat the edges where you cut the decking, so it doesn't rust. It'll be strong or stronger than the plywood, completely waterproof, and probably lighter.
Don't have to buy it from here, this link is just as an example of what you want:
Galvanized Steel Decking | Metalmart
I'll think about it for the floor. I'd use it for the walls but it is too thick, I only have about 3/4" TOPS on each side to play with.
A 4x8' (32 sq ft) sheet of marine grade treated 1" plywood from the local lumber store here (Seattle, WA) area is $85/sheet.
$2.65 /sq foot
A 12x3' (36 sq ft) 20 gauge 1" form deck panel from a local steel building supply costs $100/sheet.
$2.77 /sq foot
The steel decking, when installed on 5' centers, has a live load rating of 210 lbs/sq foot.
I didn't look up a comparison rating for the plywood, but I bet if you lay it on two centers 5' apart, it's not going to hold 200 lbs in a single square foot in the center.
A 4x8' sheet of 3/4" treated ply, which is what I will use, is $40 here. I am installing this stuff like 18" on center. I hate using wood in a manner like this too, but the fact of the matter is I probably won't own this thing in 5 years, I am 20 and make little money, and I am leaving for a 7 week, 9,000 mile road trip in less than 2 months. Yes, I know, I am a typical capitalist American who thinks in the short term and thinks everything is disposable, haha. I just want to get this done and make this trip happen, that is more important to me right now. Also, this thing gets driven less than that amount a year and sits around 95% of the time where the wood would be dry. It isn't being bombarded with saltwater or anything (not anymore, anyway).
Thanks for the input.