Most any bigger alignment shop should be able to do trailer axle alignments which is done by bending them, the best way to do it is to have the boat at full load meaning as much weight in it as you would trailer it with to get the proper amount of bend in the axle to where it would ride, full tank of fuel at minimum. I always have axles aligned on new to me boat and light duty trailers once I get the load on it even my travel trailer axles have been done. Part of proper trailer axle alignment is to also have the axle adjusted forward or back for the correct tongue weight distribution "If it has an adjustable axle" Some boat trailers do some don't have saddles that slide on the frame..
The price of an alignment is about the price of a pair of tires at most, well worth the time to have it done.
I have had a couple stock trailers aligned too over the years but didn't have any load on them lol, they can overcompensate just a bit on heavier trailer axles.
I used to work at Inland truck parts and service and when in the old location where RDO trucks is now had an alignment pit which made doing trailer axle bending a breeze also did front axle bending on OTR trucks the same way but they were a huge PITA!!