GTS225 wrote:I think you should add the extras. Even a pickup box is held on with 8 bolts, and that trailer will probably bounce around a bit more then the TV's backside.
I believe in overkill, when securing/fastening items. When I installed my two-layered (1/2" birch plywood + 1/4" luan plywood) as my deck on the 4x8 TTT, I went overboard with bolts/screws adhesives.
After gluing the the 4x8 birch ply to the tubular steel perimeter frame (and the interior crossmembers, too) with a 3/8" bead of PL Premium adhesive, it was bolted to the 11 gauge angle crossmembers (from the original 50"x 60" frame), using eight 3/8" carriage bolts, stainless fender washers, and nylock nuts. Then, after using TB2 to adhere the luan top sheet to the birch ply, I used thirty-eight #7-18 PBH Tek screws to secure the outer perimeter of deck to the tubular steel frame (also 11 gauge).
As far as shear strength goes, for the fasteners/adhesive (not counting the TB2), I came up with these figures, just for fun, but probably not accurate as to proper strain calculations (never got my engineering degree): possibly 95468 lbs of accumulated holding power, when added together.
A) 38" of PL Premium (in a 3/8" bead size- a full tube was consumed) used for the wood-frame primary set-up @ 590 psi tensile/shear strength (per inch?) equals 22420 lbs
holding power.
B) eight 3/8" grade 2 carriage bolts in single shear @4903.5 psi equals 39228 lbs holding power.
C) thirty-eight #7-18 PBH "Tek" screws thru 3/4" of plywood into 11 gauge steel @ 890 psi (single shear) equals 33820 lbs holding power.
Overkill for sure, but why take chances? I'm sure these are not cumulative in effect, but anyway it shows structural cohesion ample enough, for any forseeable travels.