Welcome to Mayo Clinic Connect, @cgypsy. I concur with Laurie (@roch). It depends on which campus you are visiting.

I do know that Florida has a large parking lot on their campus dedicated to RVs if you will be driving one down and you can park over night there. You may want to contact the concierge desk to see whether or not you would need a parking pass to do so. You can also contact them to find out if there is an RV park nearby at any of the other campus's as well.

Traveling to a new place for medical care can be stressful. Mayo Clinic Concierge Services can help make your trip go smoothly. They provide information about travel, lodging, Mayo Clinic and community resources to plan your visit. And it’s free.
Contact form: http://bit.ly/2nM3mr0
Hours: Monday-Friday, 8 a.m.-6 p.m. CST by phone, 8 a.m.-5 p.m. in person
Location: Mayo Building, Lobby level, International Center
Email: concierge@mayo.edu
Phone: 507-538-8438

@cgypsy, will this be your first visit to Mayo Clinic?

Yes. Husband just sent medical records. Appt Feb 1st

@cgypsy, I'm tagging @nancykamitchis who visited Mayo Clinic, Phoenix with a trailer at this time last year. She may have some tips to offer about RV parks that are convenient and suitable.

Awesome, thank u

Does anyone know if the Mayo has RV spot on campus or near in Arizona? I start my 3rd round of chemo Jan 24th and we are traveling from Washington back to Arizona
Thank you

Hi @ggwash21. I moved your question to this existing discussion about arriving at Mayo Clinic in Arizona by RV. I did this so you can connect with @cgypsy and @nancykamitchis who also chose RV accommodation while undergoing treatment.

I also recommend contacting Mayo Clinic Concierge Services to find out about current availability regarding parking. I know Nancy ran into some obstacles with construction a couple of years ago. So you want to make sure you have current status. Here's how to contact @lmindela and the Concierge Services:
Info: https://www.mayoclinic.org/patient-visitor-guide/minnesota/concierge-services
Call: 507-538-8438
Email: concierge@mayo.edu

@ggwash21 Hi and just thought I would add some local info. I live in Arizona about 1.5 hours from the Phoenix campus and there is still major construction still going on mostly on building 3 which is the cancer center. I can't say that I've seen a lot of parking lot area for RV's But I'm not really asked that question before. They also have part of one of the parking lots closed down for covid testing and one of the employee lots is closed due to construction. Now I do know Arizona is a big RV goto place with many parks and this time of year they fill up fast so you may want to be looking right now. For temporary overnight stays I do know alot of the Walmarts allow overnight parking may help if delayed finding a place. This n is our high season for RVs so timing may be a factor. Typically right after the holidays is when we get our largest influx of Northern visitors. So I hope you find something if I can help with any other local things please let me know.
Blessings

Hello @ggwash21, there are a few RV parks that I found near Mayo Clinic Phoenix. I hope this will help;
https://www.visitphoenix.com/places-to-stay/?view=grid&sort=qualityScore&bounds=false&filter_subcats%5B0%5D=383