When in doubt about a plant yank them out.
I'll just add that when RV'ing you also need to know about the indigenous poisonous plants IN the states you are traveling in are.
The first time I parked in Florida my dogs all started foaming at the mouth when I put them outside......I was parked next to a full hedgerow of what I thought were real pretty flowers that are VERY common landscaping plant.
Sadly these landscaping plants are also quite often found in CG's! :R
OLEANDER
Description: A frequently planted landscape shrub with lance-shaped leaves up to 10 inches long. Flowers are pink, red or white in terminal clusters.
Toxic portion: All parts, extremely toxic. Symptoms: Contact may cause a rash; if eaten, causes nausea, dizziness, irregular heartbeat, unconsciousness and death.
Another 'highly toxic' shrub common in Florida is the Yesterday, Today and Tomorrow flowering shrub.
And not to forget how I almost lost 3 dogs last year to a Black Cherry Tree. How my poor dogs have survived me traveling to Florida is nothing short of a miracle.