How big a pain to sell a 17 year old Alpha Gold?

Talk to the park and see if they would consider showing the rig to buyers for a commission. If not, does your mother have friends at the park that would be willing to take on that task? Get it cleaned up as much as possible. Price it right and it will sell. Remember every single rig you see on the internet is not sold, so figure on getting less than the comparable rigs' asking prices.