Welcome to the fun of RVing and great memories. Before taking off you need to check the DOT date codes on the side of the tires. Hopefully it will end in something like 2411 (24th week of 2011) not 1006 which would make them over nine years old. Do not judge the tires by the amount of tread as MH tires age out before we wear them out. Sitting for long periods of time is hard on them and not keeping enough air in them shorten their life. No way would I start out without putting AT LEAST two new on the front regardless of age as you have no way of knowing how they were treated. A blowout on the rear is exciting (you accelerate before starting to slow down) and one on the front can be fatal if you panic and put the brakes on hard. Be safe and have fun.
Watch this
video.