I just got back 2/10. Rented a cart for the week from Ultimate Rentals. Had it all worked out ahead of time, they corresponded promptly to my emails, delivered & picked up from my room, and overall I was extremely pleased with their service. No problems with the cart all week - not counting a bump I hit up North that sprung a minor leak under the cart, I dropped the cart off at Ultimate, they gave me a replacement and had my original cart fixed within an hour.
Thus I'd recommend you consider using them.