No. TDE builds axles for OEM trailer manufacturers. We do have several trailer parts distributors that sell what they consider ‘stock” or common sizes. Should you need a replacement axle, contact your trailer manufacturer or a trailer parts supply company.
Yes, especially with multi axle trailers. Spring axles have some forgiveness with the equalizer between the springs. Torsion axles do not have this feature and towing an un-level torsion axle trailer places most or all of the trailer weight on one axle. This will lead to premature tire wear, loss of braking power and possible axle or trailer damage.