Old scenario, suit case bomb on ship, transferred to shrimp trawler, taken to a Gulf port, packed onto a U Haul, and driven to the target. Small town USA isn’t going to be the target, the huge population centers are the targets. Most likely Miami, NYC, LA,or Las Vegas. Detroit and Chicago, not so much but Washington DC could be, but I don’t think the Terrorists could contend with the traffic.
Any nuke they get in here will be large and not that powerful. For maximum impact (deaths) you nuke a full sports stadium. Park a large van near the stadium
"Washington DC could be", that would a grand slam cleanup if the chief narcissist were addressing a joint session of Congress.
I'd miss all the historical buildings and Arlington National Cemetery but maybe a clean slate would make it worthwhile. Instant Urban Renewal!
Regards,
GtG