I renovated 75% of our 60-odd year old house w/ an 88' Civic Si hatch and a crusty 3 rail motorcycle trailer w/ a kustom drop-in deck made of plywood and 2x4s.
Once I brought a massive load of stick lumber and sheetrock home from Home Despot. I tried to get the tied down as far forward as possible but I still ended up with maybe 100, 150 pounds of ~negative~ tongue weight. On the 10 mile highway drive home I was white-knuckling it in the right lane @ about 53 mph. Anything above that - and I mean like 1mph more - and the whole rig would begin a horrifying death-spiral oscillation.
I will not mention the time (after I finally bought a ratty '99 Dakota Sport V6 2WD) that I had an even larger load of stick lumber, plywood and T1-11 (actually, exactly a bed completely full stacked perfectly tightly) slide out of the bed intact. It was like a C130 doing a L.A.P.E.S deployment but without the parachute. Not my finest moment...