What can we do to bring our trailer up to date?

I'd go with the paint first, Thela. It sounds as if you've done a good job of updating already, but perhaps if you share some photos you'll get more specific answers. I agree there are few solutions given on here for manufactured housing, but many can be adapted. My sister owns one that is much newer than yours, but she's remodeled it beautifully, modifying ideas that others have used in regular homes.

Definitely paint the paneling first. I would suggest a bright white. Then look at furniture colors, including kitchen chair cushions. Check out pictures in decorating magazines such as HGTV magazine for current color trends. Colors will update your look quickly.

As for counter space, could you make or order wood covers for your cooktop to give you more work room?

I have redone my double wide. If you paint over the paneling prime first for good coverage over the dark color. You will still have be careful because it will scratch off if furniture hits it. I took the little moldings off and used chalking stuff to fill the gap before I painted. another thing would be to put in shelving about five feet up or so and then do that board décor that is so popular, then maybe the walls won't be so temperamental. I also used an accent color in my rooms to warm them up. I have all new kitchen cabinets with an island, but I do have a double wide. It probably doesn't look like a single wide as much as you think. Another good idea is the look at little houses and even a fifth wheel they are making and redoing. They can be done quite stylish.

I leave my appliances out too for ease in use. Maybe a cart of some kind that can be moved into work space of kitchen when you need it.

I am so glad that you are up for a challenge!!! I agree with others that priming (using a stain blocker) and painting the paneling is the best way to mask the paneling. I've seen some people who actually fill the vertical lines in the paneling with sheetrock mud before priming. Good luck!!!!