What do you pull your cars with?

i have a heavy *** C channel frame 70s trailer. it tows pretty nice. straight. i tow it with my 03 hemi 2500 with 4.10s. its a pretty good combo. real steep hills you really have to lay into it but it works. i used to tow it with my 03 1500 quad cab with 4.7 and 3.55s. that worked too but not well. i was going to have 4.10s put in and install airbags but decided to just get rid of it. i think it would have worked fine with those 2 things. thats just uhauls policy. insurance or something. my buddy wanted to rent a tree chipper one day and asked to use my truck, sure. they told him he needed a 3500 or better. anyway here it is.