I hear you. Making sure you can cash flow the monthly expense in wost case scenarios is important as cash is always king.
Getting the same quoted price cash or credit makes sense as the manufacturer carries the note, not the dealer & dealer acquisition cost is the same either way. (Ignoring potential dealer inventory financing expense, loan fees, commissions, etc.)
A local financial institution may have better terms & conditions to fit your cash flow especially if you buy used from a private party. Remember cash is king & talks louder on a private party sale /forums/images/graemlins/grin.gif
Marketing 0% dealer financing has moved a lot of hardware, but is not really 0%. Dealers are trained masters on solving problems and making it easy to transfer your pocket full of money to theirs /forums/images/graemlins/confused.gif
On my tractor, I surveyed stocking dealers within 1000 miles on pricing. My local dealer was still lowest, he pays cash for his inventory, & I took the cash back option from the manufacturer.
Have fun & keep your options open /forums/images/graemlins/grin.gif