Tongue Jack Blowing Fuses

Not sure if this belongs in Travel Trailers or Tech but here goes: My electric tongue jack keeps blowing 30 amp fuses. I don't recall this happening for the first year or two I had it but suddenly earlier this year I started having trouble. There is a manual override but it is very difficult to crank. I have a supply of fuses that has helped me out of a jam but I'd be curious to know why this is happening in the first place. I don't see anywhere where it says what size fuse to use, 30A is what it came with new so that is what I have been using. I know that in general the recommendation is to not insert a higher rated fuse and to inspect everything because fuses blowing could be a sign of other trouble. The problem is that I can't seem to find anything wrong. This typically happens if the jack is over-extended in either direction (not on purpose or for a long time but you never know when it will stop until it stops) or when just starting to lift the tongue. Any ideas?

Thanks!