Ask your selling dealer if they have on-site hookups and, if so, can you stay a night or two to test everything out (if no on-site hookups, possibly a nearby campground). Tell them that you would like them to prioritize any items you find and fix them (assuming they don't need to order parts, of course) as soon as you do your extended test. Our dealer encouraged us to stay overnight on their lot and sent our sales manager and a tech out first thing the next morning to take care of anything further we found in our overnight inspection.
Not sure at what stage of full-timing you are (since you mentioned ordering a truck, I would assume first time). If you are not yet to the phase where you have already gotten rid of most of your stuff, I would highly suggest living full-time in your unit near your home for a month or more. Bring stuff out to the trailer you think you will need and make it a point to seriously decide what you can do without. Take that stuff back to the house (or storage unit, or Goodwill, whatever). We lived in ours for four months near our home and by the time we hit the road we weren't spending countless stops buying things at stores because we didn't think we'd need them.