Re: the bonds. You pretty much have to ask/check/verify what the outstanding bond amount is, property by property. The general suggestion from many folks is to not pay the bond off when you buy a home in TV - mindset being that you'll never realize that money when you would sell. If you know you're going to be there til they drag you out toes-up, then it might make sense to pay it off up front if you'd like. For some reason, prevailing mentality seems to be that many buyers don't bother to factor the outstanding bond amount into the purchase price of a home......which makes no sense to me. But that's just me!
I view it as an outstanding obligation for the house - call it a bond or whatever you'd like. It's money you owe for the property. Regardless - - - to the original point, verify what the bond amount is.
Re: the manufactured homes. I don't know it to be fact personally but I've heard from several people that the cost of insurance will be higher for a manufactured home than for a site built home (of equal selling price/valuation), probably due to the fact that they would be more susceptible to damage in severe weather. Also - again, from what others have said - some insurance companies might not be willing to cover a manufactured home built prior to a specific year. Might be related to construction techniques, etc. from back when it was manufactured. Verify all this with your insurance agent.
Bill