If it has the floor plan you like and has been maintained, it's a good trailer. They all have issues....even the new ones. You'll be fixing things. It's just the cost of admission.
First things first....what's the GROSS weight of the trailer (not DRY weight). Second, what is your truck rated to pull? Consider engine, transmission, and rear gear ratio. "Tow package" can mean many things...it may just mean a hitch, lighting, and transmission cooler. You need to know specifically what it can tow safely.
Ensure that the truck's rating exceeds the gross weight of the trailer. We like to allow a 10-20% buffer if you tow in the mountains....ie if the truck is rated at 10K lbs of towing, keep it under 8000. Flat landers can get away with slightly more.
Happy shopping.
PS...few if any of us get it right the first time. Look at as many units as time allows before signing on the dotted line. Make 3 lists...
1. What it must have.
2. What it cannot have
3. What would be nice to have.
Don't deviate from lists 1&2 or you will be unhappy later. Get as much of list #3 as you can. Spend an hour with it and see how everything fits.....bed, bathroom, galley, everything. If you find something that sets off an alarm in your head, keep shopping. Also, look for signs of water intrusion....ie...discolored ceiling or wall panels, bulges, etc.