Whichever you get, consider a drop down angled floor entry for the P500, OEM roof is tight with standard height door. 18 ft with P500 and Rancher atv only has about a 2 ft realistic extra play, with aftermarket bumpers/winch, and cargo box. Did 8x18x 7 ft. high for walking around and strapping down room. Spartan brand, empty about 2800lbs.