I guess my main question is they said it is technically used now so there would be no warranty. Is that right or are they trying to slip one by?
They are blowing smoke at you, and that's not a good sign. The price would have to be very, very attractive to get me to bite on that.
A vehicle only becomes "used" if it has had the title issued to some person or company. However, the manufacturer could declare it to be "as is" (no warranty). For example, if the rig was damaged enough, the manufacturer might sell it "as is" to the dealer rather than pay to ship it back to the factory for repair. Then the dealer might fix it up, perhaps in a "quick & dirty" manner, and then sell it as "used".
I might be willing to buy that trailer after a careful inspection, but I have 20+ years experience with RVs and a lot of tech skills to draw on. For a newcomer to RVs, the risk of not spotting a potential problem area gets much higher.
You didn't mention the price, which can be a great leveler when the situation if "iffy". RVs are typically heavily discounted from MSRP, with 15% discount being almost a given and 20-30% not unusual. Some dealers offer discounts, but them cheat by charging for things that should be included as a normal part of the sale. For a "new" rig with no warranty and an unknown repair history, I would be expecting to pay maybe 60% of MSRP, with no other fees except tax, tag & title. If the deal isn't in that ballpark, I would walk. I might walk anyway after looking at the repairs and asking a lot of questions, but the price has to be worth the risk before digging deeper.