umm-my opinion is doesnt make cents to spend thousands to accept a job unless this were long term. An older MH no matter how good of shape its in today- is still a mechanical unit that could potentially cost a lot/ and or simple aggravation of maintenance. I'm just looking at risk. You have a truck. Id opt for a trailer, least inexpensive temporary housing. Newer ones could be had cheap-easily resold. Though again depends on time.
Unless this is transition to MH (though a 20? year old) seems another can o worms, and it seems you have enough already open?