I would do some research on where to sell the porsche in your area to a private party. That might mean CL, listing it by ad, consignment, etc. But try that for a month or two before going to a dealer. But definitely sell it, no reason to keep something like that in your garage when it doesn't give you pleasure equal to the cost. Just the upkeep alone makes it worth getting rid of it, and then consider the opportunity costs of the money that is tied up in the porsche.
The SUV should go, simply get a nice economical and fun to drive car. You can afford something nice after selling those two vehicles, but nothing fancy and no loan.
I would start with the other two vehicles because they are much bigger priorities and then figure out the bike. My gut tells me you already know it should go, but maybe it would be the one thing you keep for a while, but solve the big issues first of the porsche and SUV.
Forget about the % loss on the items, it isn't relevant. They are not worth any more than you can get for them at this point, so the money is already lost. I repeat, that money is already gone, selling them doesn't make you lose the money, it's already lost. The one and only question is whether you want to lose MORE money in depreciation and maintenance over time, along with the opportunity costs of the money tied up in those items.
Glad to hear you have other spending well in hand, but use that as an excuse to ignore the huge gains you can have by fixing the vehicle situation. Best of luck!
