Class C's and travel trailers have the same appliances, plumbing, electrical amd gadgets. Class C's are like trailers mounted on a cutaway van chassis. You will need to learn care and feeding of house batteries with either, possibly have some plumbing leaks and electrical glitches. Fridges, roof AC units, water heaters and generators can eventually have problems. Tires need to be replaced every 5-7 years for safety. Some spend money on steering and suspension improvements. Trucks need maintenance and repair, maybe somewhat more reliable if they are driven frequently. Don't buy an old 'money pit" unless you are really handy with repairs, have time and workspace.