painting cabinets

Ask the experts at a paint store like Sherwin Willams and not a big box store.

Personally, I would lightly sand with 220 or 320, wipe down with dust rag, prime, then paint.

Use a plastic adhesion promoter, it is available at most paint stores.

I have used this product on my home kitchen cabinets without sanding, and it works great.

http://www.rustoleum.com/product-catalog/consumer-brands/zinsser/primer-sealers/bulls-eye-1-2-3-water-base-primer

They actually specify that sanding is not required with this product. The trailer would see far less use than a home kitchen so I think it would hold up just fine.

Without sanding or the chemical prep, the paint won't stick properly and will be a waste of your time, IMO.

Ny campers cabinets are real wood... looking to paint em white. Not looking for professional but look ok...

Ny campers cabinets are real wood... looking to paint em white. Not looking for professional but look ok...

All depends on what you are painting over. Wood, vinyl, something else.
What kind of paint?
How good do you want it to look?
How long do you want it to last?

I've painted cabinets and molding, the key is the prep. First I'd clean them really well, after removing doors, the hardware and drawers. I've used a product called liquid sandpaper which is wiped on and available at most stores that sell paint products. What it does is chemically etch the paint. Good luck!