Bed/bumper mounting

[Trick95]

I'm posting in newb because I feel like an idiot even asking about it and I know how much everyone loves basic crap with shit paint napkin engineering in the not an idiot sections.

Truck: 89 F150 RCSB. Mostly DD with at most moderate trails. Doesn't need what it's getting, but why rebuild an 8.8/ttb 44 when you can 60/10.5?

Once the weather gets better need to get my ass in gear, do the axle swap, and figure may as well do a bunch of other crap over the summer while it's apart.

Plans for other crap: Move fuel tank to just behind cab. Whack off end of frame that's buggered up. Build bumpers. Build Flatbed.

Flatbed will be roughly 70" L x 72" W tapers to 48"w over last ~20". Basic Nothing fancy. Ladder bar spine that parallels the frame just high enough to clear the hump. Tool box at the front, gas filler in framing holding toolbox on driver side, battery box in framing on passenger side, built in storage above the wheels, spare mounted in the middle against the toolbox, and taper/tailgate skinned in expanded.

Wanted to have bed rearmost mount as far back as possible, but due to the missing inches the rear leaf hanger will be right there.

Was also considering 2 more bolts per side (not shown/left side of red/not in spring hanger) to total 6 per side and/or bumping up to 9/16th bolts... but considering means nothing if the whole concept is flawed.

Here's are the questions: Am I asking too much from the bolts holding the leaf hangers on? Will this kill a bus load of nuns?
Would it be less stupid to just forget the separate bed mount and weld it to the hitch support crossmember? Will just the bumper/recovery points/hitch be too much?

My head says between 1.4 and 3.7 bus loads, but I've spent way too much time searching with no results and am going in circles. You all have forgotten more than I'll ever know so here I am.

 

[PurfsMcGurfs]

If the bed mount is sandwiching the frame opposite the shackle hanger, you probably wont have any issues. I would not tie the bumper into the shackle hanger bolts though. Did you already cut the frame rails shorter?

 

[Trick95]

Did you already cut the frame rails shorter?

Not yet. I can't really do anything until weather/days off line up and I can get out to it. Once I get the bed off I'll be able to see how bad the end of the frame really is. If it's usable that gives me about five more inches to work with.

Plan B was to make the "red" insert into the frame about 1" from the hanger bolts, the inner crossmember for the hitch (left side "blue") would go to plates on the frame, that would put 6 bolts on each side to the frame, toss two more chunks of tube near the frame parallel to the receiver so nothing can twist, and mount the flatbed to the crossmember.

Thinking about it a bit more Plan B may be the way to go regardless of frame condition. That would be 6x (8 if frame has usable length) 9/16" bolts per side and not using the hanger bolts. Hell, doing it that way I could make a mount on top of the parallel tubes and install a rear winch too.