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After having one with and one without I wouldn't even consider a traveler trailer without a slide out. Especially with a family. Tandem axle for sure. Elksnout
Look into Outdoors Rv and Northwood mfg. both quality Rv made in Oregon built for camping in the Northwest. If you’re interested in quality you have to look into there models.
I looked at a bunch of trailers and the best quality IMO were Jayco, and Grand design. I ended up with a Grand Design, 31' and love it.