It really depends on the year and model of the Ram that you have in that a quick Google search will have the numbers all over the place from 6,450 lbs on up to over 12k lbs. My tow rig is a 2010 Toyota Tundra with an 11k+ lb tow rating and except for steep hills, it's very easy to tow my boat with it. Comparatively though, my boat has a dry weight of 3,500 lbs and total weight with fuel, engine, trailer and so forth is probably close to 7k lbs. Your boat, depending on which model of 25' Sailfish it is, has a dry weight of anywhere between 5,125 lbs on up to over 6k lbs. Which I'm thinking will put your total trailering weight at over 10k lbs, especially if you have twin outboards, it's completely full with fuel, you're loaded down heavily with a lot of gear, etc. To me, unless your Ram 1500 is rated up near 12k lbs, I'm thinking it's likely not up to the challenge, or at least not for any serious distances, or up/down steep terrain, slippery boat ramps, etc.