Sounds like you have a plan.
The take away point folks should get is to not sweat the brand names, quality varies greatly for construction and materials even in the supposed "best" brands.
Quality really comes down to ones opinion, what is perfect for one person may in fact be a lemon for another.
If one FAILS to do some periodic maintenance, one will ultimately pay the price in leaks.
The end goal though is to find a trailer which has a floor plan, decor and such which matches your taste.
Hopefully in the end your family will have great memories of their short time spent together while "camping" and not let the small things in life (leaks, broken or non working items) dampen your time together.
We still have a good chuckle over our first time camping after rebuilding our first trailer. Picture road tired travelers stopping to sleep overnight and a heavy thunderstorm finds a spot in the roof that I missed and water drips out of the new ceiling and light fixture which was directly above our bed... It wasn't funny at the time but later we realized that it is just part of life..