How can I create more storage in trailer with very little wall space?

Use any wall space you do have like over the washer & dryer, above the bed & nightstands. If you have any small areas you could get a tall skinny cabinet. You might have to reorganize the lay out of the furniture to utilize some of those areas best. Instead of short items like a dresser, go with an armoire or chest of drawers.

Not knowing the size of your trailer, I ask: Can you place storage drawers under furniture? Maybe find a small rolling cart that you can use wherever needed, Is there space in a closet to add a shelf above or below the rod? Can bedding, etc be stored in Space bags? Can you add drop down shelves underneath your existing cabinets? , or above your bed? Does your furniture do double duty, like storage stools or tables that fold or have storage shelves underneath? Hanging shoe organizers can be doubled up to hold utensils, sewing stuff, craft stuff, tools, etc. You could even build a raised floor area with storage under it. If there's anything you can store outside the trailer, can it go under, over, or hang on the side? Take some trailer tours , check out Camping World, etc. for products you might be able to implement.

I feel your pain. We live in a mobile home too. We put shoe holders on the backs of closet doors and bathroom doors to hold any needed items. In the coat closet we use it for gloves, scarves, winter hats, garden tools, and many other items like common tools for the house (hammer, screw driver, wrench). In the bathroom shoe holders we put rolled up wash cloths, small items which would not fit in the few drawers, and even extra cosmetics. Then under the bed we put roller tubs that are flat enough to fit under the bed to store extra off season clothes, shoes, and linens. 3 fit under our king size bed easily. We also bought end tables for the bedroom that have 3 drawers in them, put up extra shelves in the closet and use a 3 step folding stool to reach the top ones, put up extra shelving in the laundry room, a narrow in depth book shelf (9 inches deep) in the hallway and in the laundry room, and at the end of our tub there was a foot deep by 4 feet long space and we added an open book shelf and used wicker looking baskets to store more linens and large towels. Behind our couch we have a card table and folded chairs that do not show. On the back of the spare bedroom we added a hanger for the ironing board and iron, and in the pantry door we added a metal hanging shelf on the inside of the door for more hanging shelves. We put command hooks on the inside of cupboard doors to hang measuring cups and spoons. On the inside of the bottom cabinets we put hanging baskets to hold cutting boards and muffin tins and also lids to pots/pans. We built an island on rolling wheels to have extra storage and drawers in the kitchen. It moves about as needed to set it out of the way depending on if we are working or eating at the time. We added extra shelves in all the other smaller bedroom closets. Then added a bench and storage in the hallway behind the front door for coats, boots. This summer we plan to add on an extra room out of our front deck for storing nonperishable things like our paper products, extra laundry soap etc. and a freezer. WE may also add a wardrobe for winter coats and metal office cabinets for electrical tools that can be locked up, and boxes for Christmas decor. Hope this helps and gives you a few ideas.

Thank you I appreciate very much your helpful responses and understanding of the lack- of-space issue. I’ll take all your suggestions into consideration.😊