Actually, all states that border on TX allow double towing
(I guess some call it triple, but I only see two vehicles being towed). Very common here in ID/UT/NV. But legal in most states.
However, states do put an overall limit on the length, and some states (I believe CA for one) require a special license. So need to know the overall length.
I actually saw a guy pulling (very slowly) out of a FS campground in WY a few years to with a older model F150, with a good size trailer on the back and a good size boat behind the trailer. And I will emphasize, he was pulling VERY SLOWLY. In fact, I would bet I got parked my popup, leveled it, opened it up, and started on a walk with the dog before he made it to Cody about 30 miles down the road.
And not sure if this map is actually up to date.