The MSRP will vary on identical units from dealer to dealer. Unlike the window stickers we all see on cars and trucks which are printed by the manufacturer, RV dealers print their own from what I see.
While the factories probably recommend a MSRP to the dealers, they can legally put any price on an RV they wish. This summer I was talking to a Colorado Lance dealer about a new well equipped 1172 model. The salesman started talking about a 20% off price without a trade. The MSRP they were using was about $47,500 which would have made the price $38,000. The next day a couple from California pulled into the campground where we were staying with a new 1172 on a new Ford F450, a sweet looking rig. Later in talking to the owner, he said he had paid $33,500 for the Lance, about 30% off the MSRP from a dealer ner the Lance factory. But he also bought and had installed new tie downs, a new Class 5 hitch and stinger so that he could tow his car trailer, some cab shocks, etc. so the dealer made some profit on the extra stuff as well.
We only have one Lance dealer in Florida, so if I get serious about buying, I will check with them, but will also price them in the Midwest and west coast. Current Lance I bought used here in Florida, and the previous Lance from a dealer in Tennessee. We are now on TC number 5, spread over the last 39 years.