OP here. Just to confirm - I do check cold tire pressure before each trip. I keep a compressor onboard just for this reason.
So far my longest trip in the MH was about 125 miles each way. Also as for weight, Because my trips are local I have never had to load up my MH. My fresh water tank is never more than 1/2 full. My grey and black tanks are empty before each trip. My basement storage has does not have all that much in it. We have never had to pack for more than a week so we dont carry much in the way of food or clothing. So I guess we tend to be underweight.