On Wed, 7 Mar 2018 07:01:39 -0800 (PST), True North wrote:

Mr Luddite....we've been looking at various small travel trailers but can't find anything that appeals to me in the limited selection available locally.
I'd like something bright and airy....with a good sized bathroom and maybe a bed that converts into a sofa. Don't like trailers where the oversized bed takes a third of the floor area all the time. Or when you can't even get around both sides of the bed. Anything you've come across that's an improvement over the same ole..Same ole?
BTW...our max size would be about 18 feet in length and about 3500 lbs.in weight.

There are no 18 foot trailers with 'good sized' bathrooms. You might consider buying an 18'er,
ripping the bed out, and installing a sofa bed.