Your MH is newer than mine but from my experience I would opt for an alignment only if I had noticed odd wear on the front set.
On my last MH I put on Coopers all the way around and never had it aligned or worried about an alignment. No odd wear after I sold it 10 years later. On the new MH its been 3 years on a new set all the way around and have not noticed any odd inside, outside or tread wear.
No doubt they will suggest an alignment, maybe even all the way around. IMO I wouldn't get it unless I thought I needed it, not just solely based in their recommendation.