Suggestions:
- take truck into a reputable independent shop for an assessment. Lack of power and/or intermittent loss of power could be a number of things.
- take truck & trailer to a scale to get actual weights. I suspect the actual TT wt. is higher than you think. I would go by the GVWR until you confirm it's actual weight.
- when was the last time you pulled the drums to inspect the brakes? Should be done every year or two depending on mileage. You could be shocked at what the condition of the drums, shoes and magnets are in. I'd also inspect all the brake wiring, including splices in A-frame.
While you have the drums off, if you haven't done it for some time or at all, you should do a bearing inspection & repack.
My BIL owns a large auto wholesale/retail parts shop in Spruce Grove and would know some good auto shops in Edmonton if you would like a recommendation or two.
