How to transport used MBL 101 speakers w/o crate?

I have just purchased a used pair of MBL 101 MKII speakers (original crates not available) and now need to transport them about a 1.5 hour drive to my home. I can't find any info on how to do this and the seller is not helpful since he had them delivered and set up for him. Since they weight 175 lb each, I was thinking of renting a Uhaul and using a furniture dolly.

My big question is whether these speakers can be tilted for 30 to 40 degrees off vertical for short periods of time in the process of wheeling them around on the dolly. Seller didn't think so but I would think they would be able to take it if they can be shipped overseas. Any advice?

Thanks