I'm afraid I have to agree with Mark!
I have lost count of the trailers I have had in the last 45 years. In those 45 years I have never had to align an axle on a trailer.
Everything from a tent trailer, small Shasta TT, 10,000 lb. stock trailer, 3 boat trailers, a big dual axle 5th wheel TT, a Trillium
, 2 Scamps a motorcycle trailer and now an ATV trailer, sail boat trailer and a 16' Scamp
At my late age in life I'm sure I have forgotten a few.
I broke a spring shackle on my stock trailer and had to have it replaced.
Not one of my trailer had any adjustments for axle alignment.
I have refurbished four or five Scamps, two Trilliums, two Burros and one U haul.
None of their axles were adjustable.
I don't think there is a TT made with an adjustable axle.
The only reason I can think of for a misaligned TT axle is excessive wear or a broken component or an accident.
New people to travel trailers don't worry about axle alignments. I personally have never heard of it.
PS I forgot, a Trails West Campster
was my first fiberglass trailer.