Glad you were able to do it without having to put in the water. Bunks look cool too (but pricey!).
I seem to always lose 1 or 2 bolts on a bunk in the course of a year, despite new hardware, lock washers and jam nuts. I tried to raise mine in the garage as you did but got a little cautious when the boat didn't lift at all.
I have to say I repaired it at Trinidad this year - great place to work on the trailer as there's virtually no boat ramp traffic (possibly for good reason...)