All this talk about vinyl is amusing. My inexpensive trailer built by a now-defunct division of a twice-sold company (just since I bought my trailer) has solid wood cabinet doors: solid wood for the door frame and decent thickness plywood for the insert. However, the cabinets themselves are made with press board with a printed vinyl covering for the frame, and very thin plywood with a veneer for the sidewalls. I'm quite happy with my trailer, but even so, pointing out that the doors are wood as evidence of good construction (presumably better than mine) doesn't impress me.
That said, I've looked at Lance trailers and really like them, and think them well built (just not because they have wood cabinet doors). It's a shame they don't make hybrids.