Relocation assistance

What's generally included when a potential employer offers relocation assistance? We're already in the process of trying to sell our current home and I stumbled on a posting offering 50% more pay than I'm currently getting and profit sharing, benefits, and a signing bonus.

My concern is selling our current home, the market where we currently live is struggling and this job is about 600km away. I don't want to contact them only to be unable to sell my house and move up there.

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