BobsYourUncle wrote:
Do be careful of what you use.
Prefab cabinets from big box stores are nearly always made from particle board.
Aside from the weight issue, these cabinets are totally unsuitable for anything that moves down the road. They will break apart and wind up in pile of firewood on the floor. They are designed for in place use only, not moving.
RV cabinets are made from small dimensional lumber, and paneling or luan glued and stapled to it. They are much stronger and will withstand the bouncing around and flexing as you travel down the road.
They are very easy to fabricate, except the doors take a little more effort. But the cabinet boxes are amazingly simple. A small tablesaw, some KD spruce and off the shelf 1/8" paneling, wood glue and an 18 or 20 ga stapler and you're in business.
Fabricating your own is good advice and also can be very cost effective.
Build a simple wood frame from 2x2s, then glue and nail 1/4" paneling or luan to the frame. Doors can be 1/2" plywood or 1/2" plywood with oak or maple veneer.
You control the quality, you control the fit and finish and you make the cabinets fit to the space you have.
Prefab knock down stuff often is difficult to fit into your space, takes much more effort to assemble and the results is cheap looking junk in a couple of years.. And that is in a home that isn't moving constantly.