Need new tires??

[dfoxhoven]

So coming home from our trip this weekend, I had one of my tires blowout. I have a 2009 KZ Spree 324bhs GVWR (7950). It came with Milestar tires ST205/R75/15...i have 3 questions:

1) Do I need to replace all 4 since I had a blow out or just the one that blew out (not exactly sure how many miles I have on them, but tread still looks good using the old Penny method).
2) Do I need to replace them with 15" or can I go up to a 16" to give me a little more clearance (and help with sewer emptying)?
3) Does anyone recommend or have good experiences with certain brand/type??

I'm a novice when it comes to tires...so all suggestions welcome!

Thanks

[ScottG]

Replace them with Maxxiss brand ST tires and you wont have to worry about them. Most importantly avoid cheap Chinese made tires at all costs.