My girlfriend's Tacoma with a V6 yanks my 20 and a half foot Blazer with a 3 liter around great, it also towed my 19 foot Basscat PII around great too. Even a big bathtub ranger 20 footer might weigh 3500-4000 at a maximum, just make sure you have good brakes and a good transmission cooler and buy a glass boat, as big as you can afford. Won't regret it.
Bullet 20XRD Comp - Merc 300XS
Mallard Marine Trenton, Tx