We found the model we loved locally, then did the comparison shopping within a days drive. We ended up with about 33% off msrp from a high volume dealer of the manufacturer we chose. Many other dealers had the EXACT model/options for a msrp of up to 4000 dollars more than the msrp of the dealer we purchased from, just proves msrp is a fictional number. We also made the "offer" online which made our shopping so much easier, they could take it or leave it. No one's time wasted.
Find the trailer you love then shop around, 30% off is very doable.