Please help. I am thinking of fitting some basic spring assistors like basic donut etc. My oufit tows well,but i have been told that these cheap devices can make a difference to general stability. Can anybody please comment. My outfit is a Coachman Amara 520/4 and Ford Mondeo 2L TDCi.I know this is 95% match but with my experience i find this outfit very good and stable but I am always looking to improve if poss.