No there is no case.
The owner of a property has a duty to keep the premises reasonably safe to persons on the property.
The courts have grappled with what this means and how it applies in a myriad of circumstances, but having handled many cases over 20 years here is how I think it comes down on your facts: Basically you are saying they should have noticed that the flatbed cart presented a danger to you and either warned you about it or removed it. Their defense, called comparative fault or contributory negligence, is essentially that OK, we should have been on notice of the danger but so should you have noticed it. Therefore, they will contend, we are not 100% liable and we may be less than 50% liable.
So, I'm not optimistic that you can prove that they breached any duty to you.
Two final and essential requirements of any negligence case are that you have a burden to prove that any injury caused harm. To prove damages, you need medical opinion evidence in most cases. I respect that you are a nurse and know how to care for your injuries. However, the case needs objective medical evidence from a third party medical provider. Lacking an emergency room visit immediately after the accident or at lease a visit to the PCP, I have got to say the case is lacking a basic element. One thing physicians do is take a history, i.e. a recitation of the facts that led up to your injury. This is important for medical diagnostic reasons as well as for legal reasons. It gives you the legal element of "causation" which is an absolute must.
NOTE: although I have handled many liability cases, I do not practice in ID, and legal advice can only be given by an attorney licensed in your jurisdiction who practices in the area of your concern in a direct consultation. Most personal injury attorneys give a free consultation, so you might take advantage of this.
This is not a matter for the courts. Your damages are too slight to justify the filing fee. Your liability case is shaky because you were not watching where you were walking when you ran into the flatbed. Your proximate cause theory is one that points the finger at your conduct for the majority of the failure to act reasonably under the circumstances.
Good luck to you.
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In Idaho you would be considered an invitee. The landowner's duty to the invitee is to keep the premises in a reasonably safe condition, or to warn of hidden or concealed danger. And remember in Idaho you can only claim damages for what did happen, not for what could have happened. Tough case.