I need to transport two pelican cases without wheels. I plan to check one of them. I have a folding "Magna Cart" handcart that folds flat. I'd like to ratchet strap it to one of the pelican cases. It will still be just under 40lbs and less than linear 62".

- Are ratchet straps allowed on checked luggage? They're not locked, so TSA could un-strap them if they know how to use ratchet straps.
- Is strapping a flat-fold cart to a checked bag allowed or banned?

ALSO - I'm really cutting it close on their new 40lbs limit for my checked suitcase. I need every last pound I can get. All of Frontier's text clearly states that there's an up-charge for 41-50lbs. Does that effectively mean the limit is really 41 lbs (not 40?). What happens if I'm at 40.9 lbs? Does the charge kick in at 40.1 or 41lbs?

Thanks!