Things you can do: ensure WDH is properly adjusted and spring bars are the correct rating, shocks on TV, shocks on TT, run TT tires at max sidewall psi, run TV tires at or near max psi. We have Bilsteins on the truck and shocks on our 29' TT plus Dexter equalizers, and run tires at max. psi on TT and truck rears and never any issues with bouncing under any conditions.
However, I would consider the chances of damaging the cords inside the tires from the repetitive thump, thump, thump if the height difference between joints is large enough. Has happened to me in the past in NorCal years ago before they fixed the interstate, two on our car on the same trip and one on our new truck - the cords snapped inside. If I ever come across bad expansion joints with our TT, I'm gonna either slow way down or take a detour.
Also, the repetitive expansion joints could cause the tires to heat up inside which is a major factor in killing ST tires, leading to blowouts.
Internal damage is cumulative and one day you may have a blowout for no apparent reason (TTs do suffer blowouts from time to time). Personally, based on what we've been through, I'd be concerned about excessive bouncing and flexing of the frame and what that can do.