Of course it's possible for RV manufacturers to turn out a quality product on par with automobiles. However, I suspect the cost would be horrendous. I don't know any production numbers but I got to believe that the quantity of RVs manufactured is almost zero compared to the number of autos built. RV manufacturers don't have the economies of scale like auto manufacturers.
Building high quality and keeping the price reasonable is difficult to do. I don't think any of us would be willing to pay $75,000 for an 18' TT even if you could count on having zero problems out the door.