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.