D100 pull my Duster?

i had i 79 ford f100 300/6 auto towed a lot of junk around (when i was flipping cars )
had to tow my suburban home ,got home tried going up my drive-way had it to the floor it got 1/3 the way up and wouldn't move
never had that ever happen in anything like that ,she just didn't have enough giddy,unloaded and drove them both up
my dakota 3.9 2wd towed a lot too a few time at 80% of red line for 10min in second pulling the hills ...not a good feeling
now my 12 ram 1500 hemi never felt under powered