I am new to being a representative of a brand, but here is my take on this.
Different locations will have different costs. For example, here in Sydney our freight depot is on the other side of the city, along a toll way that costs ~$15 each way. Simply to collect a camper is the best part of two hours labour, $30 of tolls and $20 in fuel. Then a wash, inspection and handover.
The reality is that there is not a great margin in camper trailers, and many brands can't afford to share those margins with agents or distributors. Campers aren't cars, with a national network and stock funding. Most are bespoke items, made by hand, often by a family owned company that has everything riding on the reputation of their brand.
I don't think that fee is excessive.