Wife is not a fan of camping

This might be a very simple solution to your situation. Why not ask your wife what she'd like to do with the camper? If she says its OK to just keep it in storage, then do it! If she says she does not want to go camping and it's a waste of money and expense in storage, then sell it. But let her made the choice and then do it! Remember the old saying, "If momma ain't happy, no one is happy!"

Whatever decision you decide, by all means, make your wife feel important, that you still love her and she's more important to you than anything else in the world.