Don't be in a rush to sell your house. Try renting a rig or two before you buy. After a month or two travelling around this great country, that immigrants want desperately to get into, you may be better able to decide on the right motorhome for you. I think that a single female travelling south of the border is very vulnerable. A single male would be almost as vulnerable. There are some areas here in the US where local thugs prey on or harass RV'ers. You might want a 24-27 foot Class C, with improved suspension for rough country roads, that is maybe five years old but in great condition as verified by a pro truck mechanic and an RV service. Get itemized list of things needed with parts and labor estimates. Major comfort items ( roof AC, dash AC, fridge, furnace, RV generator, awning, converter/charger and house batteries can cost from $300 to over $1000. Six new Michelin tires cost $1300. Tires older than 5 years should be replaced. Engine cooling system, brake system (including brake fluid replacement and front flex lines, should be carefully inspected. Fuel system and fuel pump should be serviced as needed. An RV is a box truck full of appliances and devices that have limited useful life, more like a cabin cruiser boat that requires attention and maintenance than a car or SUV. Find out about emergency road service and other needed insurance in Mexico and South America. Get good advice and take advice with a grain of salt.