This question will give you many different opinions and has been asked a lot. You should be fine with it, but just because its a 30' 5ver doesn't make it OK or not OK. Hook it up as it is to be towed and take it to a certified scale. If your within your axle weight ratings, your legal. You can lighten the weight by keeping only enough water in your fresh water tank to use the toilet when travelling. The down side is no dry camping, if you keep it to the letter of the law. My Arctic Fox at 34' could be towed by my 2500 that way, but I have never dry camped with it before, and I sold my 2500 to my brother so its a mute point, just some food for thought. As far as the suspension springs are concerned it might sag a little, but if its within the axle ratings I don't see the need. However it would be great if you can get the Airbags reinstalled.