Ricktwuhk

First, remember that the bottom of the washer is heavily weighted. Therefore, it's unlikely to tip.

How you do it depends on where your tiedowns are. If you have ones in the bedrails in addition to the low ones on the side of the bed, you can use them in combination. Each appliance should be against a side of the bed - whether front, side, or back. Flat against it. So you can't put them where the wheel well's are.

Measure first, but I suspect that both will fit side by side against the tailgate. You can then use one strap from lower to upper on the other side, and repeat on the other side, forming an X. That should work fine. If you stop carefully, then won't have any reason to move - acceleration pushes them against the tailgate, braking tries to send them frontwards and the straps stop that.

Tenkei

It went great, thanks! My ratchet straps weren't long enough to wrap around it, so I just used the cleats and went over the washer and dryer. I think I was overly nervous for no reason haha

Martian

After I lost a couch on the highway, I learned there was no such thing as nervous for no reason

Tenkei

The move is done, but I will keep what you said in mind for the future!

Ricktwuhk

Yeah, there is no such thing as too many straps either. I just took a truckload of furniture and a tailgate carrier with a dresser on it. The dresser was strapped length-wise and twice width-wise, and then one strap around the furniture pad of the circumference of the chest.