Looks very good for its age, and it's a desirable model, with the rear bed. The seller talks openly about possible imperfections, such as the furnace.
Of course, we can't look under all that lovely wood to see how good a job he did on the new floor.
A good question might be "Did you do a complete off-frame restoration of the floor?" since he alludes to new sub-floor... Also, there is no mention of the axles, and on a '78 model, I think we can assume they need replacing. However, that wouldn't stop me, if the exterior is as nice as it appears to be.
If it's to be, it's up to me.