Surly LHT is now available in 26". It is intended as a touring bike not an MTB. Sounds like it would suit your needs.

Wheel base is a weird one. Some older MTBS had very slack steering with the result that they had the same wheelbase measurement as a touring frame, but the short seat stays and upright posture of an MTB. Not what i would want for a touring bike. So my initial response to your heading was caution, but if you want the Sakkit, Thorn, Surly type "MTB" then it makes sense.