Size surely effects landing preformance? Size and weight factors, heavy landings etc.
Larger a/c being larger, meaning they carry more weight, but having to land in the same area/distance as an F50, these factors wil surely increase the risk of tail scrapes, its rare you hear about F50s, D328s ATRs etc tail scraping.
Whereas RJ/146s exsperiance their fair share.
One thing I have noticed, RJ/146s are lower to the ground than other aircraft, the A318 is much heigher from the ground, so just going on size will cause more trail strikes isn't 100% fair to go by.
But size/weight issues will effect this.