F450 or F250

[queen of spades]

I tow a small tractor now but am looking to upgrade to something that can pull a dump trailer or flat trailer with bobcat/mini ex.

Have a line on a couple of relatively low mileage vehicles - both older trucks (80s). I really like the F450 with the disc brakes on front and back, but the insurance is almost double what I pay for my current pull vehicle (Ranger v6, 4wd).

I usually prefer overbuilding but am wondering if the 450 is still just too much truck for my needs? Will a F250 pull a 7k bobcat and more importantly stop without rear-end puckering?

Both trucks I'm looking at are diesel.