This is the 4.6 liter V-8. I have checked & rechecked the oil. I do believe this truck lost every drainable drop by the time we got it to the parts store. It holds 7.9 quarts w. filter change. Added 7 quarts & allowed long drain down = didn't even show on stick. Slowly added quart 8, came to mid-fill level. Ran it about one minute, top end clatter oh no. 10 minute drain down = oil not showing on stick. Added about another 1/2 quart, oil level back to mid-level, waited, started it & engine then silenced. Now shows mid- fill level w. 8.5- 8.6 vs. oil change 7.9 quarts. I think most oil changes don't occur after 25 miles of bouncing on a flatbed + two more hours sitting by the road before that w. no drain plug. This was a serious "drain down". Also think top end clatter had nothing to do with that last 1/2 quart, just took time to get oil everywhere again. Pressure showed great after 8 and 8.5 quarts.
On taking it 150 miles to the dealer: I called Toyota road assist & they said I could tow it anywhere for diagnostic, that was before I located drain plug hole. I was 150 miles away + a zillion other things meant tow to my cottage 35 miles then tow to dealer 130 miles--on a Saturday-- then take me home 16 miles from there etc. to leave me there w. nothing...for a drainplug.
I do appreciate the advice here, just trying to explain what happened. I'm hopeful...