I thought I'd wait until my 'litigation' with Harbor Freight was wrapped up before adding anything to my original thread.  It was a rather drawn out process and I didn't want to make this tedious.  So, here's the results of this issue:
Numerous emails between myself and Harbor Freight's Customer Support group resulted in no apology, no resolution and no reimbursement. Disappointing to say the least.  So, I then did two things at once:  I filled a complaint with the 
Consumer Product Safety Commission and another with the 
Better Business Bureau.  I've yet to hear anything from the CPSC however, the BBB complaint got an immediate response from Harbor Freights Corporate HQ in Calabasas, CA.
In the BBB complaint, I gave a full account of the issue and asked only to be compensated in the amount of $297 for 'out of pocket' expenses (which would more than reimburse my friend and I for the cost of new support bars and frame reinforcements for both lifts.)  After a couple of back and forth emails, an actual phone call occurred (I was stunned) during which they agreed to send us a check for the full amount if we'd agree to sign a product liability release form.  We agreed.  (I found this part amusing as the lift was 'unsafe' in it's original state and 'safe' after the modifications.  Also, they felt the need to be 'off the hook' for any further liability issues with me.)
So, here's how the dollar figures broke down:
Original retail cost of each lift (on sale with an additional 20% off coupon): ........ $365
'Good will' amount deducted from the price of 
each lift by local Harbor Freight store
for having to return 
one damaged lift: ................................................... $106
New 'cost' of each lift: ...................................................................... $259
Actual cost of new support bars and frame modifications per lift: .................... $95
New 'cost' of each lift: ...................................................................... $354
Reimbursement per lift from Harbor Freight due to BBB complaint: .................. $148
New 'cost' of each lift: ...................................................................... $206
So, in the end, each lifts actual price went from $365 to $206.  Not much satisfaction for the effort I expended on this but, I did learn some things about Harbor Freight and it tracks with most large corporations:  They won't do a thing for you until they're in danger of receiving 'bad press'.  I've also had my faith in the BBB renewed (once again) as any time I've used them I've had immediate and positive results from the company that was causing me grief.
It's unfortunate that as consumers we are forced to 'go to war' with companies to receive any satisfaction and, for the most part, first-level customer support personnel have so little ability (or willingness) to resolve situations on behalf of their company.