Hi Mark & Prue,
The differences you are likely to find will be in the type of travel you expect to undertake. Little things like, having to pack up camp to go shopping or touring the local area. Whereas, with the van, it was a case of just jumping in the tug & going!!
Thats one. Now, think outside the square & I'm sure you will & probly have thought of others.
You might also find membership in "Cavaners forum" http://www.caravanersforum.com/index.
A big help as well.