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I'm thinking of building up a largely vehicle based space marine army, using a lot of Razorbacks, Predators, Land Speeders, and pretty much anything with an AV value. What are some things to consider when building a vehicle heavy space marine lists?

Well, as RAS want JP you're not going to have much FA... I think just remember to take at least 2 of any special vehicle (like vindicators or predators) and at least 3-4 rhino/razorback variants. Land speeders want to be similar: Have a dedicated melta squadron and a flamer squadron, and if you want some assault cannons on a separate squadron. DO NOT MIX or you will lose your effectiveness. This is one instance where size does not matter - if you only have 3 speeders, dont put them in 1 squad with different weapons...
Predators want sponsons.
LRs want something really good inside. Interpret that as you will.
Razorbacks should be a mix of lasplas and asscannon, those are the 2 most effective.
With BA I would suggest getting shield on your libbies (Which, by the way you should be taking regardless) but without that I would go with either null zone or gate of infinity - and if force dome works on the librarians transport (im not sure it does) get that and put him in the LR for lots of killy awesomeness.
Mech is more effective as BA cuz of baals and RAS as troops (make transports cheaper) + theyre fast vehicles... but meh.

I like this much better for BA.

Go with Blood Angels. Their Assault Marines are troops and get a discount on Dedicated Transports (which includes Land Raiders). Also all vehicles bar the Land Raider are Fast.

If you are taking Land Speeders I would recommend dual Multi Melta's. They can move 12" and fire both.

Keep Predators cheap. If you have lots of Lascannon Razorbacks you might even want to skip them.

Vindicators are a must, a pair, if not 3.

Dreadnoughts in Drop Pods are a good distraction. Preferably Furioso's.

Finally if you really want to go overboard, you could have Guard or Tau allies.

i think that one thing to remember is that the only vehicle marines can assault out of is Land Raiders, so if ur building around Rhinos and Razarbacks then your gonna have to be careful and smart otherwise you could be in trouble about assaulting and being assaulted.

 Brother Sergeant Bob wrote:
i think that one thing to remember is that the only vehicle marines can assault out of is Land Raiders, so if ur building around Rhinos and Razarbacks then your gonna have to be careful and smart otherwise you could be in trouble about assaulting and being assaulted.

Land speeder storms are open topped, you can assault out of them.
/pedantic nitpic

I've run a fully mechanized vanilla marine list. Land Raider full of termis, pair of tac squads in rhinos, pred, and some speeders flying escort. Looks cool and plays fun on the table. Not hyper competitive, but workable. Depending on how far you want to stretch your concept, you could add bikes, which are nice to have.

I suspect that you would do better with a BA list, as they get more options and the perk of being fast.

I agree that BA seems the best codex for this army theme, giving you plenty of mobility. Design your list in the expectation that most of your vehicles will get blown up - that's ok, so long as they've done their job (in particular transport) before dying.

If you aren't using fast vindicators in a BA mech list with FA preds your doing it wrong ;p(obvious joke but not really). unless your meta contains flyer spam 12"move and shoot vindi's are just ridiculously good. And outflanking Baal preds can be pretty gnarly.