I won't be getting the disc trucker if I go down that route as part of the theory is making the upgrade cheaper and that would require new wheels. Also slightly concerned that the LHT would be a bit too stiff for a daily ride, although fat slicks would sort that out.
It will be quite stiff to ride unladen, but not overly so, the fat tyres will help massively so, especially with 2.1 tyres.
Another one that have a similar style to your Saracen is the Velo Orange Camargue, abet cost more, and the 26" only come in the smaller size up to 53cm.
Here's the deal, LHT will feel incredibly stable in comparison.
Recommend disc for touring.