Our Jeep Wrangler started getting the "death wobble" late last year. The first time it happened was when the Jeep was being towed behind the motorhome, on the maiden voyage with the new-to-us Class A.
Then it happened again when driving the Jeep shortly thereafter. Took it to the shop. All the front end parts are still within spec, but the steering was pretty neutral, which aggravates the condition.
The fix was simple. Add more toe-in to the alignment. Now the Jeep drives and tows perfectly. The alignment shop said that's the preferred setup they do for any vehicle that's towed behind a motorhome. I've been going to them since the 80s, and always pleased with their work.