Roughly a 4500lb-5500 lb vehicle depending on how its set up. Might be pushing it on a trailer that small. Maybe you should fix the truck and drive it where you're going instead of trailer it? You'll need to pull the pump to d head gaskets. Its not hard, but its tedious and a lot of labor. The key thing is that you must untorque the head bolts in the reverse of the original torque sequnece, you'll need a good torque wrench and a manual, a gasket set, and you want to have the head and deck mating surfaces clean enough to eat off of. Its also a good idea to have a machine shope pressure chaeck and magnaflux the heads to avoid the outside possibility fo puttinga bad head back on. You'll also want to chase the threads in the block preferably with a bottoming tap. Many people insist you need to replace the head bolts, but many others, myself included have reused bolts successfully. The main thing is, make sure to use the reverse torque sequence on head removal to avoid cracking and warping them, use the right torque sequence and a properly calibrated torque wrench when applying the heads and make sure to get the mating surfaces very clean. Do that and you'll be ok.