Is it better to buy from an individual in a private sale generally, or better to go to a used car/ van dealer ? Are used vehicles generally less expensive to purchase in Quebec than in Ontario ? How about the Maratimes ?

I’ve been driving my Dodge Mini-Caravan for 13 years, and put in a second transmission and second engine. I do store to store sales, and drive thousands of kms during 8 months of the year. I took the seats out and created a second level in the van so that I can sleep and avoid expensive motel costs, while keeping supplies under the plywood board suported by milk crates.A motor home would be most comfortable, but too expensive on gas. Im trying to save for a small home, so my van will be my home for the next few years. Ive liked the feel of the Caravan but dont know others