It appears that the front end is the weak spot for Ford based motorhomes. Ours only had 16000 miles on it and the front ball joints were loose. Next time ours are replaced I will have the kind installed that allow greasing. Not as confident of long term wear on the sealed kind. We also make sure those places that have zerk fittings on the front end get a squirt each time the oil is changed.
As previously suggested have a reputable location check the front end for worn components. I would do that before investing in a lot of handling modifications.
Our 26 foot Aspect drives and handles very well, it does have the rear air bags that are kept at 35 to 45lbs. The design of the Ford front end does cause it to be effected by road irregularities.....but not to the point that it causes drivability issues. We are much more relaxed driving this motorhome than our previous one.