ARE steps involved?
Me and two friends (one skinny guy, and my wife) moved my 800 lb./40 in. safe in from the back of my truck to a bedroom (no steps), and it wasn't too bad.
Getting it down from the truck was a production, but none of us was ever in danger, we did remove the tailgate though because you are right, I think that amount of weight would do something "not too pretty" to it.
Then we put it on a soda machine dolly that I rented....that was great...until I realized it wasn't going to fit in the door tilted at an angle like that...so we lowered it down and did the 'ol back and forth from side to side to get it in the door.
They might be able to load it into the back of your truck there at Costco (I'm sure they have forklifts to get all that junk up as high as they stack it). That's how they loaded mine into our truck when we picked it up....it took them all of 10 seconds
If you're near Ft. Worth I'd be willing to help for free...if you are in Dallas I'd come help for a free dinner at The Mansion....or somewhere less fancy if you prefer
Rob