Get underneath the truck with a flashlight and track down the source of the leaks. It's really not that difficult and if your mechanic says "it's not worth it" he's giving you bad advice. Get a new mechanic.
The PS fluid leak can be either the steering box, pump, or hoses. Should be easy to spot where the leak is coming from. Replace the leaking parts - PS fluid is pretty harsh on rubber and if left long enough it could damage the belt, hoses, bushings, etc. Stop leak is good stuff, but if the leak is big enough it won't help.
"Leak from the back of the engine" usually means coolant, and it's usually caused by a bad head gasket. Pretty good guess considering your mileage. Unfortunately it will only get worse so the best course of action is to replace the head gaskets. There's an outside chance that it's the valley pan gasket or the throttle body heater, but my money is on the HGs.
You don't seem to be a DIYer, so the fixes won't be cheap. You could easily be looking at $3000 in repairs between the steering and the head gaskets.
The PS fluid leak can be either the steering box, pump, or hoses. Should be easy to spot where the leak is coming from. Replace the leaking parts - PS fluid is pretty harsh on rubber and if left long enough it could damage the belt, hoses, bushings, etc. Stop leak is good stuff, but if the leak is big enough it won't help.
"Leak from the back of the engine" usually means coolant, and it's usually caused by a bad head gasket. Pretty good guess considering your mileage. Unfortunately it will only get worse so the best course of action is to replace the head gaskets. There's an outside chance that it's the valley pan gasket or the throttle body heater, but my money is on the HGs.
You don't seem to be a DIYer, so the fixes won't be cheap. You could easily be looking at $3000 in repairs between the steering and the head gaskets.