Just an observation, but have noticed that on several brands of TT's the front caps seem to collapse some or dent inwards while under tow. What causes it? Do they "bounce" back when not under tow?
Most likely caused by lack of structure or support behind the cap. There is a frame on the "outside" edges of the cap, but maybe not enough (or any?) cross support going horizontal. Our last TT had an aluminum cap, really just a sheet of aluminium with the brand logo stickered on. Ours had a few support bars and did not collapse or push in while towing.
It would most likely be unusual to see huge concave areas on front caps while towing, but who knows.